Remove token revocation logic and unused dependencies

Eliminated the `RevokedToken` model and associated logic for managing token revocation. Removed unused files, related tests, and outdated dependencies in authentication modules. Simplified token decoding, user validation, and dependency injection by streamlining the flow and enhancing maintainability.

backend/app/core/config.py

@@ -14,6 +14,7 @@ class Settings(BaseSettings):
     POSTGRES_PORT: str = "5432"
     POSTGRES_DB: str = "eventspace"
     DATABASE_URL: Optional[str] = None
+    REFRESH_TOKEN_EXPIRE_DAYS: int = 60
     db_pool_size: int = 20  # Default connection pool size
     db_max_overflow: int = 50  # Maximum overflow connections
     db_pool_timeout: int = 30  # Seconds to wait for a connection
@@ -24,6 +25,7 @@ class Settings(BaseSettings):
     sql_echo_pool: bool = False  # Log connection pool events
     sql_echo_timing: bool = False  # Log query execution times
     slow_query_threshold: float = 0.5  # Log queries taking longer than this
+
     @property
     def database_url(self) -> str:
         """