feat(i18n): add update flag strategy settings

Add new "updateFlags" section to settings navigation and implement update flag strategy configuration. The strategy allows users to choose when update badges appear:
- Match updates by base model (only show when new release shares same base model)
- Flag any available update (show whenever newer version exists)

Includes translations for English, German, Spanish, and French locales.

py/routes/handlers/misc_handlers.py

@@ -201,6 +201,7 @@ class SettingsHandler:
         "priority_tags",
         "model_card_footer_action",
         "model_name_display",
+        "update_flag_strategy",
     )
 
     _PROXY_KEYS = {"proxy_enabled", "proxy_host", "proxy_port", "proxy_username", "proxy_password", "proxy_type"}

py/services/base_model_service.py

@@ -271,7 +271,7 @@ class BaseModelService(ABC):
         if isinstance(strategy_value, str) and strategy_value.strip():
             strategy = strategy_value.strip().lower()
         else:
-            strategy = "any"
+            strategy = "same_base"
         same_base_mode = strategy == "same_base"
 
         records = None

py/services/settings_manager.py

@@ -61,7 +61,7 @@ DEFAULT_SETTINGS: Dict[str, Any] = {
     "priority_tags": DEFAULT_PRIORITY_TAG_CONFIG.copy(),
     "model_name_display": "model_name",
     "model_card_footer_action": "example_images",
-    "update_flag_strategy": "any",
+    "update_flag_strategy": "same_base",
 }