feat(monitoring): add Beszel fleet integration to Monitor page

- New api/services/beszel.ts: Zod-validated Beszel API client with
  PocketBase auth, system fetching, and MySQL upsert
- New api/routes/beszel.ts: GET /api/beszel (read) + POST /api/beszel/collect (trigger)
- Updated api/server.ts: register route, add to 5min scheduler
- Updated src/pages/Monitor.tsx: Fleet section showing all 17 systems
  with CPU/RAM/disk bars, status dots, container count, and link to
  Beszel dashboard

Architecture: Beszel hub → API → tbl_eal_monitoring (category='fleet')
→ Monitor.tsx grid. Collected every 5min alongside existing metrics.

api/routes/beszel.ts

@@ -0,0 +1,36 @@
+/**
+ * Beszel Fleet API Route
+ * GET /api/beszel        — fleet data from MySQL
+ * POST /api/beszel/collect — trigger fresh collection
+ * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
+ */
+import { Router } from 'express'
+import { getFleetData, collectBeszelFleet } from '../services/beszel.js'
+
+const router = Router()
+
+// GET /api/beszel — fleet data
+router.get('/', async (_req, res) => {
+  try {
+    const data = await getFleetData()
+    res.json(data)
+  } catch (err: unknown) {
+    const message = err instanceof Error ? err.message : 'Unknown error'
+    console.error('[BESZEL API] GET failed:', message)
+    res.status(500).json({ error: message })
+  }
+})
+
+// POST /api/beszel/collect — trigger collection
+router.post('/collect', async (_req, res) => {
+  try {
+    const data = await collectBeszelFleet()
+    res.json({ ok: true, collected: data.total, up: data.up, down: data.down })
+  } catch (err: unknown) {
+    const message = err instanceof Error ? err.message : 'Unknown error'
+    console.error('[BESZEL API] Collect failed:', message)
+    res.status(500).json({ error: message })
+  }
+})
+
+export default router