Add configuration and database core

app/main.py

@@ -1,8 +1,39 @@
+from __future__ import annotations
+
 from fastapi import FastAPI
+from fastapi.staticfiles import StaticFiles
+
+from app import __version__
+from app.config import Settings
+from app.db import init_db
+from app.room import RoomManager
+from app.routes_admin import router as admin_router
+from app.routes_student import router as student_router
 
 
-def create_app() -> FastAPI:
+def create_app(settings: Settings | None = None) -> FastAPI:
+    settings = settings or Settings.from_env()
+    rooms = RoomManager(settings)
     app = FastAPI(title="Live In-Lecture Quiz Portal")
+    app.state.settings = settings
+    app.state.rooms = rooms
+
+    @app.on_event("startup")
+    async def startup() -> None:
+        await init_db(settings.db_path)
+
+    @app.get("/healthz")
+    async def healthz():
+        return {
+            "ok": True,
+            "version": __version__,
+            "sessions_active": await rooms.sessions_active(),
+            "ws_clients": rooms.ws_client_count(),
+        }
+
+    app.mount("/static", StaticFiles(directory="static"), name="static")
+    app.include_router(admin_router(settings, rooms))
+    app.include_router(student_router(settings, rooms))
     return app