feat: add requests CRUD endpoints

src/backend/main.py

@@ -4,6 +4,8 @@ from fastapi import FastAPI
 
 from src.backend.api.routes.health import router as health_router
 from src.backend.api.routes.topics import router as topics_router
+from src.backend.api.routes.requests import router as requests_router
+from src.backend.api.routes.sessions import router as sessions_router
 from src.backend.db.database import init_db
 
 
@@ -17,3 +19,5 @@ app = FastAPI(title="OpusAgent", version="0.1.0", lifespan=lifespan)
 
 app.include_router(health_router, prefix="/api")
 app.include_router(topics_router, prefix="/api")
+app.include_router(requests_router, prefix="/api")
+app.include_router(sessions_router, prefix="/api")