feat(server): API proxy routes for services and nodes (TDD)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/routes/nodes.py

@@ -0,0 +1,44 @@
+"""Node health endpoints for the Farm Manager API server."""
+
+import asyncio
+
+import httpx
+from fastapi import APIRouter
+
+from server.config import get_nodes
+
+router = APIRouter()
+
+
+async def _check_node_health(http_client: httpx.AsyncClient, node: dict) -> dict:
+    """Query a single agent's /health endpoint and return a NodeStatus dict."""
+    url = f"http://{node['host']}:{node['agent_port']}/health"
+    try:
+        resp = await http_client.get(url, timeout=5.0)
+        resp.raise_for_status()
+        data = resp.json()
+        return {
+            "name": node["name"],
+            "host": node["host"],
+            "healthy": True,
+            "containers_total": data.get("containers_total", 0),
+            "error": None,
+        }
+    except Exception as exc:
+        return {
+            "name": node["name"],
+            "host": node["host"],
+            "healthy": False,
+            "containers_total": 0,
+            "error": str(exc),
+        }
+
+
+@router.get("/api/nodes")
+async def list_nodes():
+    """Return all configured nodes with their current health status."""
+    nodes = get_nodes()
+    async with httpx.AsyncClient() as client:
+        tasks = [_check_node_health(client, node) for node in nodes]
+        results = await asyncio.gather(*tasks)
+    return list(results)