Update relay-handling logic and test assertions for device binding and local IP resolution

- Correct test cases to ensure proper relay IDs are switched.
- Add robust local IP resolution for relay-device bindings, including caching and inventory backfill.
- Introduce fast-path options for relay status and switch dispatch.
- Validate PHP extensions (`curl`, `sqlite3`) in edge agent images.

services/edge-agent/test/agent.test.mjs

@@ -120,6 +120,23 @@ test("relay status and switch commands support both Shelly RPC and legacy endpoi
   assert.equal(switched.on, false);
 });
 
+test("relay switch commands fail quickly when the local Shelly request stalls", async () => {
+  let calls = 0;
+  const hangingFetch = async () => {
+    calls += 1;
+    return new Promise(() => {});
+  };
+  const startedAt = Date.now();
+
+  await assert.rejects(
+    () => setRelayState({ localIp: "10.1.0.31", channel: 0, on: true, timeoutMs: 50 }, hangingFetch),
+    /HTTP request timed out after 50ms/
+  );
+
+  assert.equal(calls, 1);
+  assert.ok(Date.now() - startedAt < 500);
+});
+
 test("runUpdate stages a pending verification restart after installing new artifacts", async () => {
   const tempDir = await mkdtemp(path.join(os.tmpdir(), "edge-agent-update-"));
   const configPath = path.join(tempDir, "config.json");