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

s2s_client/api/routes/config.py

@@ -0,0 +1,54 @@
+from __future__ import annotations
+
+from typing import Any
+
+from fastapi import APIRouter, Request
+
+from s2s_client.core import config as settings
+from s2s_client.core import logging as app_logging
+from s2s_client.core import urls as core_urls
+
+router = APIRouter()
+
+
+def _effective_s2s_url(request: Request) -> str:
+    return settings.SPEECH_TO_SPEECH_URL or core_urls._proxy_public_url(request)
+
+
+@router.get("/api/config")
+async def config(request: Request) -> dict[str, Any]:
+    """Client bootstrap: whether web search is available, whether the deploy runs
+    behind a load balancer (so the browser uses the /api/session proxy),
+    and whether the user may instead set a direct
+    s2s server URL. The LB address itself is intentionally NOT included.
+
+    2026-09-24: new top-level `apipilot` flag. When True the deploy exposes the
+    new `/api/apipilot/tools` and `/api/apipilot/execute` proxy endpoints (see
+    docs/client/tool-calling.md) that the browser may call directly instead of
+    hardcoding upstream tool URLs / names."""
+    app_logging.logger.debug(
+        "[INTERNAL] /api/config requested client=%s", request.client.host if request.client else "?"
+    )
+    primary_prompt = settings.S2S_PRIMARY_PROMPT
+    out = {
+        "search": bool(settings.SERPER_KEY),
+        "lb": bool(settings.LOAD_BALANCER_URL),
+        "allowDirect": not settings.LOAD_BALANCER_URL,
+        "s2sUrl": _effective_s2s_url(request),
+        "primaryPrompt": primary_prompt,
+        "reasoningType": settings.S2S_REASONING_TYPE,
+        "injectProfile": settings.S2S_INJECT_PROFILE,
+        "debugPrompt": settings.S2S_DEBUG_PROMPT,
+        "startSessionMode": settings.S2S_START_SESSION_MODE,
+        "theme": settings.S2S_THEME,
+        "apipilot": bool(settings.S2S_APIPILOT_TOOLS_URL),
+    }
+    app_logging.logger.debug(
+        "[INTERNAL] /api/config returned promptLen=%d reasoning=%s startSessionMode=%s theme=%s apipilot=%s",
+        len(primary_prompt),
+        settings.S2S_REASONING_TYPE,
+        settings.S2S_START_SESSION_MODE or "-",
+        settings.S2S_THEME or "-",
+        out["apipilot"],
+    )
+    return out