feat(distribution): 分站品牌装修可配置首页入口并上传图片

分站可单独配置回收、合作反馈和客服二维码，未配置时继承主站；Logo、图标和轮播支持直接上传。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/internal/modules/systemconfig/handler.go

@@ -5,6 +5,7 @@ import (
 	"net/http"
 
 	"hfb_sys/backend/internal/middleware"
+	"hfb_sys/backend/internal/sitecode"
 	"hfb_sys/backend/pkg/response"
 
 	"github.com/gin-gonic/gin"
@@ -82,7 +83,7 @@ func (h *Handler) HomeAnnouncements(c *gin.Context) {
 }
 
 func (h *Handler) HomeConfig(c *gin.Context) {
-	config, err := h.service.HomeConfig(c.Request.Context())
+	config, err := h.service.HomeConfig(c.Request.Context(), sitecode.FromRequest(c))
 	if err != nil {
 		writeConfigError(c, err)
 		return

backend/internal/modules/systemconfig/home_override_test.go

@@ -0,0 +1,23 @@
+package systemconfig
+
+import "testing"
+
+func TestParseHomeEntryOverrideInheritsWhenEmpty(t *testing.T) {
+	if _, ok := parseAWRecycleOverride("  "); ok {
+		t.Fatal("空配置应继承主站")
+	}
+	if _, ok := parseCooperationFeedbackOverride(""); ok {
+		t.Fatal("空配置应继承主站")
+	}
+}
+
+func TestParseHomeEntryOverrideUsesSiteJSON(t *testing.T) {
+	aw, ok := parseAWRecycleOverride(`{"title":"分站回收","subtitle":"看图","image_url":"/aw.png","enabled":true}`)
+	if !ok || aw.Title != "分站回收" || aw.ImageURL != "/aw.png" {
+		t.Fatalf("回收覆盖 = %+v ok=%v", aw, ok)
+	}
+	coop, ok := parseCooperationFeedbackOverride(`{"title":"分站合作","subtitle":"联系","image_url":"/coop.png","enabled":false}`)
+	if !ok || coop.Title != "分站合作" || coop.Enabled {
+		t.Fatalf("合作覆盖 = %+v ok=%v", coop, ok)
+	}
+}

backend/internal/modules/systemconfig/service_home.go

@@ -3,6 +3,9 @@ package systemconfig
 import (
 	"context"
 	"encoding/json"
+	"strings"
+
+	"hfb_sys/backend/internal/model"
 )
 
 func (s *Service) HomeAnnouncements(ctx context.Context) (*HomeAnnouncementsDTO, error) {
@@ -16,7 +19,7 @@ func (s *Service) HomeAnnouncements(ctx context.Context) (*HomeAnnouncementsDTO,
 	return &HomeAnnouncementsDTO{Items: items}, nil
 }
 
-func (s *Service) HomeConfig(ctx context.Context) (*HomeConfigDTO, error) {
+func (s *Service) HomeConfig(ctx context.Context, siteCode string) (*HomeConfigDTO, error) {
 	if s.repo == nil {
 		return nil, ErrDependencyUnavailable
 	}
@@ -40,13 +43,61 @@ func (s *Service) HomeConfig(ctx context.Context) (*HomeConfigDTO, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &HomeConfigDTO{
+	config := &HomeConfigDTO{
 		Announcements:       announcements,
 		Banners:             banners,
 		PublishOptions:      publishOptions,
 		AWRecycle:           awRecycle,
 		CooperationFeedback: cooperationFeedback,
-	}, nil
+	}
+	s.applySiteHomeOverrides(ctx, siteCode, config)
+	return config, nil
+}
+
+// applySiteHomeOverrides 用分站自己的首页入口覆盖主站配置。字段为空表示继续继承主站。
+func (s *Service) applySiteHomeOverrides(ctx context.Context, siteCode string, config *HomeConfigDTO) {
+	siteCode = strings.TrimSpace(siteCode)
+	if s == nil || s.repo == nil || s.repo.db == nil || config == nil || siteCode == "" {
+		return
+	}
+	var site model.DistributionSite
+	err := s.repo.db.WithContext(ctx).
+		Select("aw_recycle_json", "cooperation_feedback_json").
+		Where("site_code = ? AND status = ?", siteCode, "active").
+		First(&site).Error
+	if err != nil {
+		return
+	}
+	if item, ok := parseAWRecycleOverride(site.AWRecycleJSON); ok {
+		config.AWRecycle = item
+	}
+	if item, ok := parseCooperationFeedbackOverride(site.CooperationFeedbackJSON); ok {
+		config.CooperationFeedback = item
+	}
+}
+
+func parseAWRecycleOverride(raw string) (AWRecycleConfig, bool) {
+	raw = strings.TrimSpace(raw)
+	if raw == "" {
+		return AWRecycleConfig{}, false
+	}
+	var item AWRecycleConfig
+	if err := json.Unmarshal([]byte(raw), &item); err != nil {
+		return AWRecycleConfig{}, false
+	}
+	return normalizeAWRecycle(item), true
+}
+
+func parseCooperationFeedbackOverride(raw string) (CooperationFeedbackConfig, bool) {
+	raw = strings.TrimSpace(raw)
+	if raw == "" {
+		return CooperationFeedbackConfig{}, false
+	}
+	var item CooperationFeedbackConfig
+	if err := json.Unmarshal([]byte(raw), &item); err != nil {
+		return CooperationFeedbackConfig{}, false
+	}
+	return normalizeCooperationFeedback(item), true
 }
 
 func (s *Service) homeAnnouncements(ctx context.Context) ([]string, error) {