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>

docker-compose.yml

@@ -0,0 +1,31 @@
+services:
+  api:
+    build: ./apps/api
+    container_name: homelab-monitor-api
+    restart: unless-stopped
+    env_file: .env
+    environment:
+      - HOSTS_CONFIG_PATH=/app/config/hosts.yaml
+      - DB_PATH=/app/data/monitor.db
+    volumes:
+      - ./config/hosts.yaml:/app/config/hosts.yaml:ro
+      - monitor-data:/app/data
+    networks:
+      - web
+
+  web:
+    build: ./apps/web
+    container_name: homelab-monitor-web
+    restart: unless-stopped
+    ports:
+      - "8090:80"
+    depends_on:
+      - api
+    networks:
+      - web
+
+networks:
+  web:
+
+volumes:
+  monitor-data: