为 9 个模块添加 Context 超时控制

完成模块：
- auth: 3 个 Repository 方法 + Service + Handler + Middleware
- wallet: 已有 context 支持，修复依赖调用
- payment: 已有 context 支持，修复 wallet 调用
- adminaudit: 1 个方法
- notification: 2 个方法
- realname: 2 个方法
- systemconfig: 4 个方法
- adminauth: 7 个方法
- adminuser: 6 个方法

所有数据库调用已改为 r.db.WithContext(ctx)，完整传递 context 链路。

待完成模块: order, listing, chat 等 12 个模块（约 157 个方法）

backend/internal/modules/realname/handler.go

@@ -51,7 +51,7 @@ func (h *Handler) Status(c *gin.Context) {
 		return
 	}
 
-	status, err := h.service.Status(userID)
+	status, err := h.service.Status(c.Request.Context(), userID)
 	if err != nil {
 		writeRealnameError(c, err)
 		return

backend/internal/modules/realname/repository.go

@@ -1,6 +1,7 @@
 package realname
 
 import (
+	"context"
 	"time"
 
 	"hfb_sys/backend/internal/model"
@@ -17,15 +18,15 @@ func NewRepository(db *gorm.DB) *Repository {
 	return &Repository{db: db}
 }
 
-func (r *Repository) FindByUserID(userID uint64) (*model.UserRealname, error) {
+func (r *Repository) FindByUserID(ctx context.Context, userID uint64) (*model.UserRealname, error) {
 	var record model.UserRealname
-	if err := r.db.Where("user_id = ?", userID).First(&record).Error; err != nil {
+	if err := r.db.WithContext(ctx).Where("user_id = ?", userID).First(&record).Error; err != nil {
 		return nil, err
 	}
 	return &record, nil
 }
 
-func (r *Repository) SaveResult(userID uint64, provider string, result ProviderResult) (*model.UserRealname, error) {
+func (r *Repository) SaveResult(ctx context.Context, userID uint64, provider string, result ProviderResult) (*model.UserRealname, error) {
 	record := model.UserRealname{
 		UserID:          userID,
 		Provider:        provider,
@@ -39,7 +40,7 @@ func (r *Repository) SaveResult(userID uint64, provider string, result ProviderR
 		FailReason:      result.FailReason,
 	}
 
-	err := r.db.Transaction(func(tx *gorm.DB) error {
+	err := r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
 		if err := tx.Clauses(clause.OnConflict{
 			Columns: []clause.Column{{Name: "user_id"}},
 			DoUpdates: clause.Assignments(map[string]any{
@@ -70,5 +71,5 @@ func (r *Repository) SaveResult(userID uint64, provider string, result ProviderR
 	if err != nil {
 		return nil, err
 	}
-	return r.FindByUserID(userID)
+	return r.FindByUserID(ctx, userID)
 }

backend/internal/modules/realname/service.go

@@ -71,14 +71,14 @@ func (s *Service) Start(ctx context.Context, userID uint64, name string, idNo st
 		}
 		return nil, err
 	}
-	return s.repo.SaveResult(userID, s.provider.Name(), result)
+	return s.repo.SaveResult(ctx, userID, s.provider.Name(), result)
 }
 
-func (s *Service) Status(userID uint64) (PublicStatus, error) {
+func (s *Service) Status(ctx context.Context, userID uint64) (PublicStatus, error) {
 	if s.repo == nil {
 		return PublicStatus{}, ErrDependencyUnavailable
 	}
-	record, err := s.repo.FindByUserID(userID)
+	record, err := s.repo.FindByUserID(ctx, userID)
 	if err != nil {
 		return PublicStatus{Status: "unverified"}, nil
 	}