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/index.ts

@@ -0,0 +1,66 @@
+import "dotenv/config";
+import Fastify from "fastify";
+import fastifyCookie from "@fastify/cookie";
+import fastifySession from "@fastify/session";
+import { loadConfig } from "./config/index.js";
+import { openDb, upsertSnapshots, pruneOldSnapshots } from "./db/index.js";
+import { seedAdminUser } from "./auth/local.js";
+import { ProxmoxCollector } from "./collectors/proxmox.js";
+import type { Collector } from "./collectors/types.js";
+import { registerAuthRoutes } from "./routes/auth.js";
+import { registerHostRoutes } from "./routes/hosts.js";
+
+const HOSTS_CONFIG_PATH = process.env.HOSTS_CONFIG_PATH ?? "../../config/hosts.yaml";
+
+async function main() {
+  const cfg = loadConfig(HOSTS_CONFIG_PATH);
+  const db = openDb(cfg.dbPath);
+
+  if (cfg.adminPassword) {
+    seedAdminUser(db, cfg.adminUsername, cfg.adminPassword);
+  }
+
+  const collectors: Collector[] = [
+    new ProxmoxCollector({
+      host: cfg.proxmox.host,
+      node: cfg.proxmox.node,
+      tokenId: cfg.proxmox.tokenId,
+      tokenSecret: cfg.proxmox.tokenSecret,
+    }),
+  ];
+
+  async function pollOnce() {
+    for (const collector of collectors) {
+      try {
+        const snapshots = await collector.collect();
+        upsertSnapshots(db, snapshots);
+      } catch (err) {
+        app.log.error({ err, collector: collector.id }, "collector failed");
+      }
+    }
+    pruneOldSnapshots(db, cfg.snapshotRetentionHours);
+  }
+
+  const app = Fastify({ logger: true });
+
+  await app.register(fastifyCookie);
+  await app.register(fastifySession, {
+    secret: cfg.sessionSecret,
+    cookie: { secure: process.env.NODE_ENV === "production", maxAge: 1000 * 60 * 60 * 12 },
+  });
+
+  registerAuthRoutes(app, db);
+  registerHostRoutes(app, db);
+
+  await pollOnce();
+  setInterval(() => {
+    void pollOnce();
+  }, cfg.pollIntervalSeconds * 1000);
+
+  await app.listen({ port: cfg.port, host: "0.0.0.0" });
+}
+
+main().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});