feat: add app factory with lifespan setup

src/proxy_pool/app.py

@@ -0,0 +1,63 @@
+import logging
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from redis.asyncio import from_url as redis_from_url
+
+from proxy_pool.config import get_settings
+from proxy_pool.db.session import create_session_factory
+from proxy_pool.plugins.discovery import discover_plugins
+from proxy_pool.plugins.registry import PluginRegistry
+
+logger = logging.getLogger(__name__)
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    settings = get_settings()
+
+    # Database
+    session_factory = create_session_factory(settings)
+    app.state.session_factory = session_factory
+    app.state.engine = session_factory.kw["bind"]
+
+    # Redis
+    redis = redis_from_url(
+        settings.redis.url,
+        decode_responses=True,
+    )
+    app.state.redis = redis
+
+    # Plugin registry
+    registry = PluginRegistry()
+    discover_plugins("proxy_pool.plugins.builtin.parsers", registry, settings)
+    discover_plugins("proxy_pool.plugins.builtin.checkers", registry, settings)
+    discover_plugins("proxy_pool.plugins.builtin.notifiers", registry, settings)
+    app.state.registry = registry
+
+    logger.info(
+        "Started with %d parsers, %d checkers, %d notifiers",
+        len(registry.parsers),
+        len(registry.checkers),
+        len(registry.notifiers),
+    )
+
+    yield
+
+    # Cleanup
+    await redis.close()
+    await app.state.engine.dispose()
+
+
+def create_app() -> FastAPI:
+    settings = get_settings()
+
+    app = FastAPI(
+        title=settings.app_name,
+        lifespan=lifespan,
+    )
+
+    # Register routers here as we build them
+    # app.include_router(...)
+
+    return app