refactor(server): adopt uv and modular typed FastAPI structure

s2s_client/api/router.py

@@ -0,0 +1,16 @@
+"""Register routes in their original order without changing public paths."""
+
+from fastapi import APIRouter
+
+from s2s_client.api.routes import apipilot, caller, config, search, sessions
+from s2s_client.realtime.proxy import realtime_proxy
+from s2s_client.services.reasoning import reasoning
+
+router = APIRouter()
+router.include_router(config.router)
+router.include_router(apipilot.router)
+router.add_api_route("/api/reasoning", reasoning, methods=["POST"])
+router.add_api_websocket_route("/v1/realtime", realtime_proxy)
+router.include_router(caller.router)
+router.include_router(search.router)
+router.include_router(sessions.router)