Runner: Geruest, Eingabepruefung, Auth

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

runner/src/index.js

@@ -0,0 +1,11 @@
+import { loadConfig } from './config.js';
+import { createApiServer } from './server.js';
+
+// Jobs/Dev/Proxy kommen in späteren Tasks; bis dahin nur Stubs, damit /status antwortet.
+const config = loadConfig(process.env);
+const jobs = { submit: () => { throw Object.assign(new Error('Noch nicht verfügbar'), { status: 503 }); }, get: () => null, queueLength: () => 0 };
+const dev = { ensure: async () => { throw Object.assign(new Error('Noch nicht verfügbar'), { status: 503 }); }, stop: async () => {}, list: () => [] };
+
+createApiServer({ config, jobs, dev }).listen(config.apiPort, () => {
+  console.log(`Preview-Runner API auf Port ${config.apiPort}`);
+});