diff --git a/backend/internal/router/router.go b/backend/internal/router/router.go
index 429cd5c..264e275 100644
--- a/backend/internal/router/router.go
+++ b/backend/internal/router/router.go
@@ -222,6 +222,60 @@ func Setup(h *Handlers) *gin.Engine {
 			clientOpen.GET("/wallet", middleware.RequireMerchantFeature(h.OpenDB, model.MerchantFeatureWallet), middleware.RequireAPIScope("wallet:read"), h.Open.GetWallet)
 		}
 
+		// 平台管理端：只依赖 JWT 与角色，刻意不挂 Tenant。
+		// 平台接口本身跨商户，一旦让它们解析 X-Merchant-ID，管理员哪怕只是残留一个已禁用
+		// 商户的上下文，Tenant 就会对全部请求返回 403，整个管理端都会被锁死。
+		platform := api.Group("")
+		platform.Use(middleware.Auth(h.JWT))
+		platform.Use(middleware.RequireRole(model.RoleAdmin))
+		{
+			platform.GET("/platform/admins", h.User.ListPlatformAdmins)
+			platform.GET("/platform/merchant-accounts", h.User.ListMerchantAccountGroups)
+			platform.DELETE("/platform/merchant-accounts/:id", h.User.DeleteMerchantAccount)
+			platform.POST("/platform/admins", h.User.CreatePlatformAdmin)
+			platform.PATCH("/platform/admins/:id", h.User.UpdatePlatformAdmin)
+			platform.DELETE("/platform/admins/:id", h.User.DeletePlatformAdmin)
+			platform.GET("/platform/merchants", h.Merchant.ListPlatformMerchants)
+			// 跨商户订单视图：商户后台的 /api/merchant/orders 强制单商户隔离，
+			// 超管需要一条平台视角入口来查看全部下游订单。
+			platform.GET("/platform/orders", h.Merchant.ListPlatformOrders)
+			platform.POST("/platform/merchants", h.Merchant.CreateMerchant)
+			platform.PATCH("/platform/merchants/:id", h.Merchant.UpdateMerchantSettings)
+			platform.POST("/platform/merchants/:id/members", h.Merchant.AddPlatformMerchantMember)
+			platform.GET("/platform/product-catalog", h.Merchant.ListProductCatalog)
+			platform.GET("/platform/merchants/:id/products", h.Merchant.ListMerchantProductsByAdmin)
+			platform.PATCH("/platform/merchants/:id/products/:pid", h.Merchant.AdminUpdateMerchantProduct)
+			platform.POST("/platform/merchants/:id/products/assign", h.Merchant.AssignProducts)
+			platform.GET("/platform/merchants/:id/wallet", h.Merchant.AdminGetWallet)
+			platform.GET("/platform/merchants/:id/account", h.Merchant.AdminGetMerchantAccount)
+			platform.PATCH("/platform/merchants/:id/account", h.Merchant.AdminUpdateMerchantAccount)
+			platform.GET("/platform/merchants/:id/wallet/ledger", h.Merchant.AdminListWalletLedger)
+			platform.POST("/platform/merchants/:id/wallet/adjust", h.Merchant.AdminAdjustWallet)
+			platform.GET("/platform/recharge/applications", h.Recharge.AdminListApplications)
+			platform.POST("/platform/recharge/applications/:id/review", h.Recharge.AdminReviewApplication)
+
+			// 乐玩平台商品拉取、同步与履约路由配置
+			if h.PlatformLewan != nil {
+				platform.GET("/platform/lewan/products", h.PlatformLewan.ListLewanProducts)
+				platform.POST("/platform/lewan/sync-catalog", h.PlatformLewan.SyncLewanProduct)
+				platform.POST("/platform/lewan/batch-sync-catalog", h.PlatformLewan.BatchSyncLewanProducts)
+				platform.PUT("/platform/products/:id/routing", h.PlatformLewan.UpdateProductRouting)
+			}
+
+			// Rock平台 (0666.pro) 自动发货与库存风控管理
+			if h.Rock != nil {
+				platform.GET("/platform/rock/config", h.Rock.GetConfig)
+				platform.PUT("/platform/rock/config", h.Rock.UpdateConfig)
+				platform.POST("/platform/rock/test-conn", h.Rock.TestConnection)
+				platform.GET("/platform/rock/stats", h.Rock.GetStats)
+				platform.POST("/platform/rock/purchase", h.Rock.PurchaseTokens)
+				platform.GET("/platform/rock/tokens", h.Rock.ListTokens)
+				platform.POST("/platform/rock/tokens/:id/expected-uid", h.Rock.CorrectTokenUID)
+				platform.POST("/platform/rock/tokens/:id/reset", h.Rock.ResetToken)
+				platform.POST("/platform/rock/tokens/:id/release", h.Rock.ReleaseToken)
+			}
+		}
+
 		auth := api.Group("")
 		auth.Use(middleware.Auth(h.JWT))
 		auth.Use(middleware.Tenant(h.Tenant))
@@ -273,57 +327,6 @@ func Setup(h *Handlers) *gin.Engine {
 				merchant.PATCH("/roles/:id", middleware.RequireMerchantPermissions(h.Tenant, model.PermissionMembersManage), h.Merchant.UpdateRole)
 			}
 
-			// 平台管理员 / 发货记录 / 平台商户（仅管理员）
-			admin := auth.Group("")
-			admin.Use(middleware.RequireRole(model.RoleAdmin))
-			{
-				admin.GET("/platform/admins", h.User.ListPlatformAdmins)
-				admin.GET("/platform/merchant-accounts", h.User.ListMerchantAccountGroups)
-				admin.DELETE("/platform/merchant-accounts/:id", h.User.DeleteMerchantAccount)
-				admin.POST("/platform/admins", h.User.CreatePlatformAdmin)
-				admin.PATCH("/platform/admins/:id", h.User.UpdatePlatformAdmin)
-				admin.DELETE("/platform/admins/:id", h.User.DeletePlatformAdmin)
-				admin.GET("/platform/merchants", h.Merchant.ListPlatformMerchants)
-				// 跨商户订单视图：商户后台的 /api/merchant/orders 强制单商户隔离，
-				// 超管需要一条平台视角入口来查看全部下游订单。
-				admin.GET("/platform/orders", h.Merchant.ListPlatformOrders)
-				admin.POST("/platform/merchants", h.Merchant.CreateMerchant)
-				admin.PATCH("/platform/merchants/:id", h.Merchant.UpdateMerchantSettings)
-				admin.POST("/platform/merchants/:id/members", h.Merchant.AddPlatformMerchantMember)
-				admin.GET("/platform/product-catalog", h.Merchant.ListProductCatalog)
-				admin.GET("/platform/merchants/:id/products", h.Merchant.ListMerchantProductsByAdmin)
-				admin.PATCH("/platform/merchants/:id/products/:pid", h.Merchant.AdminUpdateMerchantProduct)
-				admin.POST("/platform/merchants/:id/products/assign", h.Merchant.AssignProducts)
-				admin.GET("/platform/merchants/:id/wallet", h.Merchant.AdminGetWallet)
-				admin.GET("/platform/merchants/:id/account", h.Merchant.AdminGetMerchantAccount)
-				admin.PATCH("/platform/merchants/:id/account", h.Merchant.AdminUpdateMerchantAccount)
-				admin.GET("/platform/merchants/:id/wallet/ledger", h.Merchant.AdminListWalletLedger)
-				admin.POST("/platform/merchants/:id/wallet/adjust", h.Merchant.AdminAdjustWallet)
-				admin.GET("/platform/recharge/applications", h.Recharge.AdminListApplications)
-				admin.POST("/platform/recharge/applications/:id/review", h.Recharge.AdminReviewApplication)
-
-				// 乐玩平台商品拉取、同步与履约路由配置
-				if h.PlatformLewan != nil {
-					admin.GET("/platform/lewan/products", h.PlatformLewan.ListLewanProducts)
-					admin.POST("/platform/lewan/sync-catalog", h.PlatformLewan.SyncLewanProduct)
-					admin.POST("/platform/lewan/batch-sync-catalog", h.PlatformLewan.BatchSyncLewanProducts)
-					admin.PUT("/platform/products/:id/routing", h.PlatformLewan.UpdateProductRouting)
-				}
-
-				// Rock平台 (0666.pro) 自动发货与库存风控管理
-				if h.Rock != nil {
-					admin.GET("/platform/rock/config", h.Rock.GetConfig)
-					admin.PUT("/platform/rock/config", h.Rock.UpdateConfig)
-					admin.POST("/platform/rock/test-conn", h.Rock.TestConnection)
-					admin.GET("/platform/rock/stats", h.Rock.GetStats)
-					admin.POST("/platform/rock/purchase", h.Rock.PurchaseTokens)
-					admin.GET("/platform/rock/tokens", h.Rock.ListTokens)
-					admin.POST("/platform/rock/tokens/:id/expected-uid", h.Rock.CorrectTokenUID)
-					admin.POST("/platform/rock/tokens/:id/reset", h.Rock.ResetToken)
-					admin.POST("/platform/rock/tokens/:id/release", h.Rock.ReleaseToken)
-				}
-			}
-
 			auth.POST("/upload", h.Recharge.Upload)
 		}
 	}
diff --git a/backend/internal/router/router_test.go b/backend/internal/router/router_test.go
index 45d9d69..edb48e9 100644
--- a/backend/internal/router/router_test.go
+++ b/backend/internal/router/router_test.go
@@ -8,6 +8,7 @@ import (
 	"testing"
 
 	"affiliate_dash/internal/handler"
+	"affiliate_dash/internal/model"
 	"affiliate_dash/internal/pkg/applog"
 	"affiliate_dash/internal/pkg/jwt"
 	"affiliate_dash/internal/pkg/openlog"
@@ -17,15 +18,18 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-func TestSetupDoesNotPanic(t *testing.T) {
+// newTestRouter 构建一个接好全部依赖的测试路由。
+func newTestRouter(t *testing.T) (*gin.Engine, *jwt.Manager) {
+	t.Helper()
 	gin.SetMode(gin.TestMode)
 	db := testdb.New(t)
 	codec, err := service.NewSecretCodec("test-master-key")
 	if err != nil {
 		t.Fatalf("codec: %v", err)
 	}
+	jm := jwt.NewManager("test-jwt")
 	tenantSvc := service.NewTenantService(db)
-	authSvc := service.NewAuthService(db, jwt.NewManager("test-jwt"), tenantSvc)
+	authSvc := service.NewAuthService(db, jm, tenantSvc)
 	userSvc := service.NewUserService(db, tenantSvc)
 	callbackSvc := service.NewCallbackService(db, codec)
 	fulfillmentSvc := service.NewFulfillmentService(db, callbackSvc)
@@ -33,12 +37,7 @@ func TestSetupDoesNotPanic(t *testing.T) {
 	rechargeSvc := service.NewRechargeService(db, fulfillmentSvc, "")
 	deliverySvc := service.NewDeliveryService(fulfillmentSvc, "", "", "", "", 0)
 
-	defer func() {
-		if recovered := recover(); recovered != nil {
-			t.Fatalf("setup should not panic: %v", recovered)
-		}
-	}()
-	_ = Setup(&Handlers{
+	engine := Setup(&Handlers{
 		Auth:          handler.NewAuthHandler(authSvc),
 		Dashboard:     handler.NewDashboardHandler(fulfillmentSvc),
 		User:          handler.NewUserHandler(userSvc),
@@ -46,7 +45,7 @@ func TestSetupDoesNotPanic(t *testing.T) {
 		SourceOpen:    handler.NewOpenHandler(fulfillmentSvc),
 		Merchant:      handler.NewMerchantHandler(merchantSvc, fulfillmentSvc, callbackSvc, deliverySvc, rechargeSvc),
 		Recharge:      handler.NewRechargeHandler(rechargeSvc),
-		JWT:           jwt.NewManager("test-jwt"),
+		JWT:           jm,
 		Tenant:        tenantSvc,
 		OpenDB:        db,
 		SecretCodec:   codec,
@@ -54,6 +53,72 @@ func TestSetupDoesNotPanic(t *testing.T) {
 		OpenAPISecret: "source-secret",
 		OpenSignSkew:  300,
 	})
+	return engine, jm
+}
+
+func TestSetupDoesNotPanic(t *testing.T) {
+	defer func() {
+		if recovered := recover(); recovered != nil {
+			t.Fatalf("setup should not panic: %v", recovered)
+		}
+	}()
+	_, _ = newTestRouter(t)
+}
+
+// TestPlatformRoutesIgnoreStaleMerchantContext 卡住一个会把整个管理端锁死的场景：
+// 平台路由一旦挂上 Tenant，管理员 localStorage 里残留一个已不存在/已禁用的商户 ID 时，
+// 所有 /api/platform/* 请求都会被 403，连"去改回来"的页面都打不开。
+// 因此平台分组只挂 Auth + RequireRole，不解析商户上下文。
+func TestPlatformRoutesIgnoreStaleMerchantContext(t *testing.T) {
+	engine, jm := newTestRouter(t)
+	token, err := jm.Generate(1, "admin", model.RoleAdmin)
+	if err != nil {
+		t.Fatalf("generate token: %v", err)
+	}
+
+	cases := []struct {
+		name           string
+		merchantHeader string
+	}{
+		{name: "无商户上下文", merchantHeader: ""},
+		{name: "残留不存在的商户", merchantHeader: "999999"},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			req := httptest.NewRequest("GET", "/api/platform/merchants", nil)
+			req.Header.Set("Authorization", "Bearer "+token)
+			if tc.merchantHeader != "" {
+				req.Header.Set("X-Merchant-ID", tc.merchantHeader)
+			}
+			w := httptest.NewRecorder()
+			engine.ServeHTTP(w, req)
+
+			if w.Code != 200 {
+				t.Fatalf("平台路由必须不受残留商户上下文影响，期望 200，实际 %d：%s", w.Code, w.Body.String())
+			}
+		})
+	}
+}
+
+// TestMerchantRoutesStillRejectStaleContext 反向卡住商户侧：
+// 摘掉 Tenant 只针对平台分组，商户后台仍必须校验商户上下文。
+func TestMerchantRoutesStillRejectStaleContext(t *testing.T) {
+	engine, jm := newTestRouter(t)
+	token, err := jm.Generate(1, "admin", model.RoleAdmin)
+	if err != nil {
+		t.Fatalf("generate token: %v", err)
+	}
+
+	req := httptest.NewRequest("GET", "/api/merchant", nil)
+	req.Header.Set("Authorization", "Bearer "+token)
+	req.Header.Set("X-Merchant-ID", "999999")
+	w := httptest.NewRecorder()
+	engine.ServeHTTP(w, req)
+
+	if w.Code != 403 {
+		t.Fatalf("商户路由必须拒绝无效商户上下文，期望 403，实际 %d：%s", w.Code, w.Body.String())
+	}
 }
 
 func TestIsPollingEndpoint(t *testing.T) {
diff --git a/frontend/src/api/request.ts b/frontend/src/api/request.ts
index 5171b01..7b226b0 100644
--- a/frontend/src/api/request.ts
+++ b/frontend/src/api/request.ts
@@ -6,13 +6,28 @@ const request = axios.create({
   timeout: 15000,
 })
 
+function currentRole(): string {
+  try {
+    return JSON.parse(localStorage.getItem('user') || 'null')?.role || ''
+  } catch {
+    return ''
+  }
+}
+
 request.interceptors.request.use((config) => {
   const token = localStorage.getItem('token')
   if (token) {
     config.headers.Authorization = `Bearer ${token}`
   }
+  // 对「商户上下文本来就不起作用」的接口，刻意不带 X-Merchant-ID：
+  // - /platform/*：平台侧接口本身就是跨商户的；
+  // - 管理员的 /dashboard：后端按角色判定为平台口径，压根不看商户。
+  // 更要紧的是，一旦 localStorage 里残留的是已禁用/已删除的商户，服务端会对这些
+  // 本该正常的请求直接 403。后端已把平台路由从租户中间件里摘出来，这里是第二道防线。
+  const url = config.url || ''
+  const merchantContextIrrelevant = url.startsWith('/platform/') || (url === '/dashboard' && currentRole() === 'admin')
   const merchantId = localStorage.getItem('merchant_id')
-  if (merchantId) {
+  if (merchantId && !merchantContextIrrelevant) {
     config.headers['X-Merchant-ID'] = merchantId
   }
   return config