Add password reset functionality, email service, and related API endpoints

- Introduced endpoints for requesting and confirming password resets.
- Implemented token-based password reset logic with validation checks.
- Added `EmailService` with `ConsoleEmailBackend` and placeholder for SMTP backend.
- Integrated password reset flow in `auth` API routes with rate limiting.
- Updated schemas for password reset requests and token confirmation.
- Refined validation for secure password updates and token verification.
- Enhanced configuration with `FRONTEND_URL` for email links.

backend/app/core/config.py

@@ -58,6 +58,12 @@ class Settings(BaseSettings):
     # CORS configuration
     BACKEND_CORS_ORIGINS: List[str] = ["http://localhost:3000"]
 
+    # Frontend URL for email links
+    FRONTEND_URL: str = Field(
+        default="http://localhost:3000",
+        description="Frontend application URL for email links"
+    )
+
     # Admin user
     FIRST_SUPERUSER_EMAIL: Optional[str] = Field(
         default=None,