first commit

backend/app/api/settings.py

@@ -0,0 +1,30 @@
+"""Runtime settings API for LLM provider and API keys."""
+
+from pydantic import BaseModel
+from fastapi import APIRouter
+
+from app.config import public_settings, update_runtime_settings
+
+router = APIRouter()
+
+
+class SettingsUpdate(BaseModel):
+    llm_provider: str | None = None
+    openai_api_key: str | None = None
+    anthropic_api_key: str | None = None
+    deepseek_api_key: str | None = None
+    custom_openai_api_key: str | None = None
+    custom_openai_base_url: str | None = None
+    custom_openai_model: str | None = None
+
+
+@router.get("")
+async def get_runtime_settings():
+    return public_settings()
+
+
+@router.put("")
+async def update_settings(body: SettingsUpdate):
+    payload = body.model_dump(exclude_unset=True)
+    update_runtime_settings(payload)
+    return public_settings()