fix: P0/P1 security and quality fixes

P0-01: Add ESCAPE clause to LIKE queries in operation_log.go and device.go
P0-02: Add atomic Increment to L1Cache and L2Cache interfaces
P0-07: Add TOTP verification step after password login
P1-01: Sanitize error messages in error.go middleware
P1-03: Remove err.Error() from export error messages
P1-04: Add error return to CountByResultSince in login_log.go
P1-05: Add transactional DeleteCascade to RoleRepository
P1-06: Add PasswordChangedAt tracking for JWT token invalidation
P1-07: Wrap theme SetDefault in database transaction
P1-08: Use config values for database pool parameters
P1-09: Add rows.Err() checks in social_account_repo.go
P1-10: Validate sortOrder with map in user.go ORDER BY
P1-11: Add GORM tags to Announcement struct
P1-15: Add pageSize upper limit (100) to device and log handlers

internal/api/middleware/error.go

@@ -22,7 +22,9 @@ func ErrorHandler() gin.HandlerFunc {
 			if appErr, ok := err.Err.(*apierrors.ApplicationError); ok {
 				c.JSON(int(appErr.Code), appErr)
 			} else {
-				c.JSON(http.StatusInternalServerError, apierrors.New(http.StatusInternalServerError, "", err.Err.Error()))
+				// 安全修复：未知错误不泄露内部详情，只返回通用消息
+				// 详细错误记录到日志，供调试使用
+				c.JSON(http.StatusInternalServerError, apierrors.New(http.StatusInternalServerError, "", "服务器内部错误"))
 			}
 			return
 		}