删除钱包充值功能并消除重复入账风险

钱包充值为开发态测试功能(生产环境本就禁用),且支付回调存在重复入账风险:入账与标记 paid 两步非原子、wallet_ledger 去重无唯一索引、幂等键使用了可变的 ProviderOrderID。直接删除该功能从根本上消除风险。

后端:
- payment 移除 StartWalletRecharge/QueryWalletRecharge 及相关 handler/DTO/常量;confirmPaid 增加 OrderID 守卫;解除对 wallet 仓库的依赖
- wallet 移除 Recharge/ConfirmRechargeFromChannel 及相关定义
- 移除三条充值路由;adminfinance 财务统计口径只统计 order_pay
- 清理充值相关测试用例

前端:
- 移除充值 API、WalletView 充值面板/弹窗、admin 充值标签与筛选
- 保留钱包余额、流水、提现等核心能力

go build/vet 与 vue-tsc typecheck 均通过。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/internal/router/router.go

@@ -186,9 +186,9 @@ func New(cfg config.Config, deps Dependencies, logger *zap.Logger) *gin.Engine {
 	}
 
 	if deps.DB != nil {
-		paymentRepo = payment.NewRepository(deps.DB, paymentConfigRepo, orderRepo, walletRepo)
+		paymentRepo = payment.NewRepository(deps.DB, paymentConfigRepo, orderRepo)
 	}
-	paymentService := payment.NewService(paymentRepo, cfg.AppEnv)
+	paymentService := payment.NewService(paymentRepo)
 	paymentHandler := payment.NewHandler(paymentService)
 	var notificationRepo *notification.Repository
 	if deps.DB != nil {
@@ -363,9 +363,6 @@ func New(cfg config.Config, deps Dependencies, logger *zap.Logger) *gin.Engine {
 		{
 			walletRoutes.GET("/balance", walletHandler.Balance)
 			walletRoutes.GET("/ledger", walletHandler.Ledger)
-			walletRoutes.POST("/recharge", walletHandler.Recharge)
-			walletRoutes.POST("/recharge/pay", paymentHandler.WalletRecharge)
-			walletRoutes.POST("/recharge/pay/:id/query", paymentHandler.WalletRechargeQuery)
 			walletRoutes.POST("/withdraw", walletHandler.Withdraw)
 		}