feat: add cordon/uncordon endpoints and node action toggles

Co-authored-by: aider (openrouter/thinkingmachines/inkling-small:free) <aider@aider.chat>

backend/main.py

@@ -115,3 +115,13 @@ def exec_pod(pod: str, namespace: str = "default", context: str = None, containe
     cmd += ["--", "sh", "-c", command]
     result = run_kubectl(cmd, context=context)
     return {"output": result.stdout, "stderr": result.stderr, "returncode": result.returncode}
+
+@app.get("/cordon")
+def cordon(node: str, context: str = None):
+    result = run_kubectl(["cordon", node], context=context)
+    return {"output": result.stdout, "stderr": result.stderr, "returncode": result.returncode}
+
+@app.get("/uncordon")
+def uncordon(node: str, context: str = None):
+    result = run_kubectl(["uncordon", node], context=context)
+    return {"output": result.stdout, "stderr": result.stderr, "returncode": result.returncode}