Add deployment Docker Compose file, testing utilities, security helpers, and database initialization script

- Introduced `docker-compose.deploy.yml` for deployment scenarios with pre-built Docker images.
- Added `auth_test_utils.py` to simplify authentication testing in FastAPI.
- Implemented `security.py` for token-based operations like file uploads and password resets.
- Created `init_db.py` for database initialization and superuser creation during startup.
- Updated dependencies and tests to support optional authentication in FastAPI.
- Enhanced entrypoint script to handle database initialization.

backend/app/utils/auth_test_utils.py

@@ -0,0 +1,129 @@
+"""
+Authentication utilities for testing.
+This module provides tools to bypass FastAPI's authentication in tests.
+"""
+from typing import Callable, Dict, Optional
+
+from fastapi import FastAPI
+from fastapi.security import OAuth2PasswordBearer
+from starlette.testclient import TestClient
+
+from app.api.dependencies.auth import get_current_user, get_optional_current_user
+from app.models.user import User
+
+
+def create_test_auth_client(
+        app: FastAPI,
+        test_user: User,
+        extra_overrides: Optional[Dict[Callable, Callable]] = None
+) -> TestClient:
+    """
+    Create a test client with authentication pre-configured.
+
+    This bypasses the OAuth2 token validation and directly returns the test user.
+
+    Args:
+        app: The FastAPI app to test
+        test_user: The user object to use for authentication
+        extra_overrides: Additional dependency overrides to apply
+
+    Returns:
+        TestClient with authentication configured
+    """
+    # First override the oauth2_scheme dependency to return a dummy token
+    # This prevents FastAPI from trying to extract a real bearer token from the request
+    oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/auth/login")
+    app.dependency_overrides[oauth2_scheme] = lambda: "dummy_token_for_testing"
+
+    # Then override the get_current_user dependency to return our test user
+    app.dependency_overrides[get_current_user] = lambda: test_user
+
+    # Apply any extra overrides
+    if extra_overrides:
+        for dep, override in extra_overrides.items():
+            app.dependency_overrides[dep] = override
+
+    # Create and return the client
+    return TestClient(app)
+
+
+def create_test_optional_auth_client(
+        app: FastAPI,
+        test_user: User
+) -> TestClient:
+    """
+    Create a test client with optional authentication pre-configured.
+
+    This is useful for testing endpoints that use get_optional_current_user.
+
+    Args:
+        app: The FastAPI app to test
+        test_user: The user object to use for authentication
+
+    Returns:
+        TestClient with optional authentication configured
+    """
+    # Override the get_optional_current_user dependency
+    app.dependency_overrides[get_optional_current_user] = lambda: test_user
+
+    # Create and return the client
+    return TestClient(app)
+
+
+def create_test_superuser_client(
+        app: FastAPI,
+        test_user: User
+) -> TestClient:
+    """
+    Create a test client with superuser authentication pre-configured.
+
+    Args:
+        app: The FastAPI app to test
+        test_user: The user object to use as superuser
+
+    Returns:
+        TestClient with superuser authentication
+    """
+    # Make sure user is a superuser
+    test_user.is_superuser = True
+
+    # Use the auth client creation with superuser
+    return create_test_auth_client(app, test_user)
+
+
+def create_test_unauthenticated_client(app: FastAPI) -> TestClient:
+    """
+    Create a test client that will fail authentication checks.
+
+    This is useful for testing the unauthorized case of protected endpoints.
+
+    Args:
+        app: The FastAPI app to test
+
+    Returns:
+        TestClient without authentication
+    """
+    # Any authentication attempts will fail
+    return TestClient(app)
+
+
+def cleanup_test_client_auth(app: FastAPI) -> None:
+    """
+    Clean up authentication overrides from the FastAPI app.
+
+    Call this after your tests to restore normal authentication behavior.
+
+    Args:
+        app: The FastAPI app to clean up
+    """
+    # Get all auth dependencies
+    auth_deps = [
+        get_current_user,
+        get_optional_current_user,
+        OAuth2PasswordBearer(tokenUrl="/api/v1/auth/login")
+    ]
+
+    # Remove overrides
+    for dep in auth_deps:
+        if dep in app.dependency_overrides:
+            del app.dependency_overrides[dep]