Scaffold homelab-monitor: Fastify API + React dashboard + CI

Vertical slice for Phase 1 (v1-dashboard milestone): Proxmox collector,
SQLite storage, local auth, and a dashboard UI showing host/container
status cards. Config-driven collector registry so future data sources
(SSH-based hosts, Zabbix, network discovery) plug in without rewiring.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/api/src/routes/hosts.ts

@@ -0,0 +1,32 @@
+import type { FastifyInstance, FastifyReply, FastifyRequest } from "fastify";
+import type Database from "better-sqlite3";
+import { getLatestSnapshots } from "../db/index.js";
+
+async function requireAuth(req: FastifyRequest, reply: FastifyReply) {
+  if (!req.session.username) {
+    reply.code(401).send({ error: "not authenticated" });
+  }
+}
+
+export function registerHostRoutes(app: FastifyInstance, db: Database.Database): void {
+  app.get("/api/hosts", { preHandler: requireAuth }, async () => {
+    const rows = getLatestSnapshots(db);
+    return {
+      hosts: rows.map((r) => ({
+        hostId: r.host_id,
+        displayName: r.display_name,
+        group: r.group_name,
+        status: r.status,
+        cpuPct: r.cpu_pct,
+        memPct: r.mem_pct,
+        diskPct: r.disk_pct,
+        memPressurePct: r.mem_pressure_pct,
+        cpuPressurePct: r.cpu_pressure_pct,
+        uptimeSec: r.uptime_sec,
+        lastSeen: r.ts,
+      })),
+    };
+  });
+
+  app.get("/api/health", async () => ({ ok: true }));
+}