Add Coolify REST API server with Scalar docs and UI integration

Express API server on :3100 exposing all Coolify operations:
- CRUD for apps, env vars, servers
- Full upsert pipeline (create/update + env + route + deploy)
- Drift detection, Traefik route management via SSH
- Scalar API docs at /reference, OpenAPI 3.1 spec

UI: New Coolify page with app cards, deploy/delete actions,
env var expansion. Sidebar nav + React Query hooks + fetch client.

Both UI and LLM/CLI use the same HTTP endpoints.

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

api/lib/coolify-client.js

@@ -0,0 +1,28 @@
+/**
+ * Authenticated fetch wrapper for the Coolify API.
+ * Ported from gitea.repo.management/electron/main.cjs:166-183
+ */
+export async function coolifyFetch(config, apiPath, options = {}) {
+  const base = (config.coolify?.apiUrl || '').replace(/\/$/, '');
+  const token = config.coolify?.apiToken || '';
+  const url = `${base}/api/v1${apiPath}`;
+
+  const headers = {
+    'Authorization': `Bearer ${token}`,
+    'Content-Type': 'application/json',
+    ...(options.headers || {})
+  };
+
+  const res = await fetch(url, { ...options, headers });
+
+  if (!res.ok) {
+    const text = await res.text();
+    const err = new Error(`Coolify ${options.method || 'GET'} ${apiPath} failed: ${res.status} ${text}`);
+    err.status = res.status;
+    throw err;
+  }
+
+  const ct = res.headers.get('content-type') || '';
+  if (ct.includes('application/json')) return res.json();
+  return res.text();
+}