feat: add Settings tab with provider management and language preferences

- Implemented AppSettings model and table using SQLModel.
- Created Settings router with endpoints for preferences and provider toggling.
- Added Settings tab to the UI with real-time health status of providers.
- Integrated language and provider filtering into anime and series search logic.
- Updated templates to respect user-defined settings.

app/models/settings.py

@@ -0,0 +1,58 @@
+"""Models for application settings with SQLModel support"""
+import uuid
+import json
+from pydantic import BaseModel, Field as PydanticField
+from typing import Optional, List, Dict
+from datetime import datetime
+from sqlmodel import SQLModel, Field, Column, String
+
+
+class AppSettingsBase(SQLModel):
+    """Base schema for application settings"""
+    default_lang: str = Field(default="vostfr")
+    theme: str = Field(default="dark")
+    
+    # Store list of disabled providers as a JSON string
+    disabled_providers_json: str = Field(default="[]", sa_column=Column(String))
+    
+    @property
+    def disabled_providers(self) -> List[str]:
+        try:
+            return json.loads(self.disabled_providers_json or "[]")
+        except:
+            return []
+    
+    @disabled_providers.setter
+    def disabled_providers(self, value: List[str]):
+        self.disabled_providers_json = json.dumps(value or [])
+
+
+class AppSettingsTable(AppSettingsBase, table=True):
+    """Database table for application settings"""
+    __tablename__ = "app_settings"
+    
+    id: str = Field(
+        default_factory=lambda: str(uuid.uuid4()),
+        primary_key=True,
+        index=True,
+        nullable=False
+    )
+    user_id: str = Field(foreign_key="users.id", index=True, unique=True)
+    updated_at: datetime = Field(default_factory=datetime.now)
+
+
+class AppSettings(BaseModel):
+    """Application settings (API Response)"""
+    default_lang: str = "vostfr"
+    theme: str = "dark"
+    disabled_providers: List[str] = []
+    
+    class Config:
+        from_attributes = True
+
+
+class AppSettingsUpdate(BaseModel):
+    """Model for updating application settings"""
+    default_lang: Optional[str] = None
+    theme: Optional[str] = None
+    disabled_providers: Optional[List[str]] = None