wire llms, ui tweaks

api/main.py

@@ -165,6 +165,78 @@ async def set_active_scenario(req: ScenarioUpdate):
         return {"error": str(e)}
 
 
+# ── LLM config routes ──
+
+@app.get("/config/llm")
+async def get_llm_config():
+    """Current LLM provider configuration."""
+    import os
+    provider = os.getenv("LLM_PROVIDER", "groq")
+    return {
+        "provider": provider,
+        "providers": {
+            "groq": {
+                "configured": bool(os.getenv("GROQ_API_KEY")),
+                "model": os.getenv("GROQ_MODEL", "llama-3.3-70b-versatile"),
+            },
+            "anthropic": {
+                "configured": bool(os.getenv("ANTHROPIC_API_KEY")),
+                "model": os.getenv("ANTHROPIC_MODEL", "claude-sonnet-4-20250514"),
+            },
+            "bedrock": {
+                "configured": bool(os.getenv("AWS_ACCESS_KEY_ID")),
+                "model": os.getenv("BEDROCK_MODEL_ID", "anthropic.claude-sonnet-4-20250514-v1:0"),
+            },
+            "openai": {
+                "configured": bool(os.getenv("OPENAI_API_KEY")),
+                "model": os.getenv("OPENAI_MODEL", "gpt-4o"),
+                "base_url": os.getenv("OPENAI_BASE_URL", ""),
+            },
+            "template": {
+                "configured": True,
+                "model": "none (structured fallback)",
+            },
+        },
+    }
+
+
+class LLMConfigUpdate(BaseModel):
+    provider: str
+    api_key: str | None = None
+    model: str | None = None
+    base_url: str | None = None
+
+
+@app.put("/config/llm")
+async def set_llm_config(req: LLMConfigUpdate):
+    """Switch LLM provider at runtime. Sets env vars for MCP subprocesses."""
+    import os
+
+    os.environ["LLM_PROVIDER"] = req.provider
+
+    if req.provider == "groq" and req.api_key:
+        os.environ["GROQ_API_KEY"] = req.api_key
+        if req.model:
+            os.environ["GROQ_MODEL"] = req.model
+    elif req.provider == "anthropic" and req.api_key:
+        os.environ["ANTHROPIC_API_KEY"] = req.api_key
+        if req.model:
+            os.environ["ANTHROPIC_MODEL"] = req.model
+    elif req.provider == "openai" and req.api_key:
+        os.environ["OPENAI_API_KEY"] = req.api_key
+        if req.model:
+            os.environ["OPENAI_MODEL"] = req.model
+        if req.base_url:
+            os.environ["OPENAI_BASE_URL"] = req.base_url
+    elif req.provider == "bedrock":
+        if req.model:
+            os.environ["BEDROCK_MODEL_ID"] = req.model
+
+    # No need to update server configs — _server_config() reads env at connect time
+
+    return await get_llm_config()
+
+
 # ── Scenario data routes ──
 
 @app.get("/scenarios/data/flights")