fix: auto-fix code issues (cron)

- 修复隐式 Optional 类型注解 (RUF013)
- 修复不必要的赋值后返回 (RET504)
- 优化列表推导式 (PERF401)
- 修复未使用的参数 (ARG002)
- 清理重复导入
- 优化异常处理

backend/localization_manager.py

@@ -963,7 +963,11 @@ class LocalizationManager:
             self._close_if_file_db(conn)
 
     def get_translation(
-        self, key: str, language: str, namespace: str = "common", fallback: bool = True,
+        self,
+        key: str,
+        language: str,
+        namespace: str = "common",
+        fallback: bool = True,
     ) -> str | None:
         conn = self._get_connection()
         try:
@@ -979,7 +983,10 @@ class LocalizationManager:
                 lang_config = self.get_language_config(language)
                 if lang_config and lang_config.fallback_language:
                     return self.get_translation(
-                        key, lang_config.fallback_language, namespace, False,
+                        key,
+                        lang_config.fallback_language,
+                        namespace,
+                        False,
                     )
                 if language != "en":
                     return self.get_translation(key, "en", namespace, False)
@@ -1019,7 +1026,11 @@ class LocalizationManager:
             self._close_if_file_db(conn)
 
     def _get_translation_internal(
-        self, conn: sqlite3.Connection, key: str, language: str, namespace: str,
+        self,
+        conn: sqlite3.Connection,
+        key: str,
+        language: str,
+        namespace: str,
     ) -> Translation | None:
         cursor = conn.cursor()
         cursor.execute(
@@ -1121,7 +1132,9 @@ class LocalizationManager:
             self._close_if_file_db(conn)
 
     def list_data_centers(
-        self, status: str | None = None, region: str | None = None,
+        self,
+        status: str | None = None,
+        region: str | None = None,
     ) -> list[DataCenter]:
         conn = self._get_connection()
         try:
@@ -1146,7 +1159,8 @@ class LocalizationManager:
         try:
             cursor = conn.cursor()
             cursor.execute(
-                "SELECT * FROM tenant_data_center_mappings WHERE tenant_id = ?", (tenant_id,),
+                "SELECT * FROM tenant_data_center_mappings WHERE tenant_id = ?",
+                (tenant_id,),
             )
             row = cursor.fetchone()
             if row:
@@ -1156,7 +1170,10 @@ class LocalizationManager:
             self._close_if_file_db(conn)
 
     def set_tenant_data_center(
-        self, tenant_id: str, region_code: str, data_residency: str = "regional",
+        self,
+        tenant_id: str,
+        region_code: str,
+        data_residency: str = "regional",
     ) -> TenantDataCenterMapping:
         conn = self._get_connection()
         try:
@@ -1222,7 +1239,8 @@ class LocalizationManager:
         try:
             cursor = conn.cursor()
             cursor.execute(
-                "SELECT * FROM localized_payment_methods WHERE provider = ?", (provider,),
+                "SELECT * FROM localized_payment_methods WHERE provider = ?",
+                (provider,),
             )
             row = cursor.fetchone()
             if row:
@@ -1232,7 +1250,10 @@ class LocalizationManager:
             self._close_if_file_db(conn)
 
     def list_payment_methods(
-        self, country_code: str | None = None, currency: str | None = None, active_only: bool = True,
+        self,
+        country_code: str | None = None,
+        currency: str | None = None,
+        active_only: bool = True,
     ) -> list[LocalizedPaymentMethod]:
         conn = self._get_connection()
         try:
@@ -1255,7 +1276,9 @@ class LocalizationManager:
             self._close_if_file_db(conn)
 
     def get_localized_payment_methods(
-        self, country_code: str, language: str = "en",
+        self,
+        country_code: str,
+        language: str = "en",
     ) -> list[dict[str, Any]]:
         methods = self.list_payment_methods(country_code=country_code)
         result = []
@@ -1287,7 +1310,9 @@ class LocalizationManager:
             self._close_if_file_db(conn)
 
     def list_country_configs(
-        self, region: str | None = None, active_only: bool = True,
+        self,
+        region: str | None = None,
+        active_only: bool = True,
     ) -> list[CountryConfig]:
         conn = self._get_connection()
         try:
@@ -1345,14 +1370,19 @@ class LocalizationManager:
             return dt.strftime("%Y-%m-%d %H:%M")
 
     def format_number(
-        self, number: float, language: str = "en", decimal_places: int | None = None,
+        self,
+        number: float,
+        language: str = "en",
+        decimal_places: int | None = None,
     ) -> str:
         try:
             if BABEL_AVAILABLE:
                 try:
                     locale = Locale.parse(language.replace("_", "-"))
                     return numbers.format_decimal(
-                        number, locale=locale, decimal_quantization=(decimal_places is not None),
+                        number,
+                        locale=locale,
+                        decimal_quantization=(decimal_places is not None),
                     )
                 except (ValueError, AttributeError):
                     pass
@@ -1514,7 +1544,9 @@ class LocalizationManager:
             self._close_if_file_db(conn)
 
     def detect_user_preferences(
-        self, accept_language: str | None = None, ip_country: str | None = None,
+        self,
+        accept_language: str | None = None,
+        ip_country: str | None = None,
     ) -> dict[str, str]:
         preferences = {"language": "en", "country": "US", "timezone": "UTC", "currency": "USD"}
         if accept_language: