fix(types): resolve mypy errors in CI

- Add type annotations to flash_middleware in main.py
- Add type: ignore comment for get_flash_messages return type

Fixes CI type check failures in:
- app/main.py:79
- app/presentation/web/flash.py:164

app/main.py

@@ -4,13 +4,13 @@ This module is the main entry point for the FastAPI application.
 Configures DI container, middleware, and routes following DDD principles.
 """
 
-from collections.abc import AsyncGenerator
+from collections.abc import AsyncGenerator, Awaitable, Callable
 from contextlib import asynccontextmanager
 
 import uvicorn
 from dishka import make_async_container
 from dishka.integrations.fastapi import setup_dishka
-from fastapi import FastAPI
+from fastapi import FastAPI, Request, Response
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import HTMLResponse
 from fastapi.staticfiles import StaticFiles
@@ -76,7 +76,9 @@ def app_factory() -> FastAPI:
     register_error_handlers(app)
 
     @app.middleware("http")
-    async def flash_middleware(request, call_next):
+    async def flash_middleware(
+        request: Request, call_next: Callable[[Request], Awaitable[Response]]
+    ) -> Response:
         """Middleware to setup flash manager for each request."""
         await setup_flash_manager(request)
         response = await call_next(request)

app/presentation/web/flash.py

@@ -161,7 +161,7 @@ def get_flash_messages(request: Request) -> list[dict[str, str]]:
         List of flash message dictionaries.
     """
     if hasattr(request.state, "flash_manager"):
-        return request.state.flash_manager.get_messages()
+        return request.state.flash_manager.get_messages()  # type: ignore[no-any-return]
     return []