Update docs and screenshots

backend/app/main.py

@@ -0,0 +1,40 @@
+from collections.abc import AsyncIterator
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.staticfiles import StaticFiles
+
+from app.api.router import api_router
+from app.core.config import get_settings
+from app.core.database import init_database
+from app.core.dependencies import app_state
+from app.core.logging import configure_logging
+from app.websocket.router import websocket_router
+
+
+@asynccontextmanager
+async def lifespan(_: FastAPI) -> AsyncIterator[None]:
+    configure_logging()
+    await init_database()
+    await app_state.startup()
+    try:
+        yield
+    finally:
+        await app_state.shutdown()
+
+
+settings = get_settings()
+app = FastAPI(title=settings.app_name, lifespan=lifespan, docs_url=None, redoc_url=None)
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+app.include_router(api_router, prefix="/api/v1")
+app.include_router(websocket_router)
+
+if settings.frontend_dist.exists():
+    app.mount("/", StaticFiles(directory=settings.frontend_dist, html=True), name="frontend")