fix(mysql): use loc=Local to avoid unknown time zone Asia/Shanghai

internal/database/database.go

@@ -107,7 +107,9 @@ func buildDSN(cfg *Config) (string, error) {
 		if cfg.DSN != "" {
 			return cfg.DSN, nil
 		}
-		dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True&loc=Asia%%2FShanghai",
+		// 使用 loc=Local，避免 MySQL 未加载时区表时出现 unknown time zone Asia/Shanghai
+		// 应用启动时已将 time.Local 设为 Asia/Shanghai (CST)
+		dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True&loc=Local",
 			cfg.User, cfg.Password, cfg.Host, cfg.Port, cfg.DBName)
 		if cfg.SSLMode != "" {
 			dsn += "&tls=" + cfg.SSLMode