feat: initial SleepGuard implementation

Wake-on-demand proxy + agent system with SvelteKit dashboard.
Monorepo: shared types, proxy (Hono + http-proxy), agent (monitors + locks), web (SvelteKit SPA).

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

.env.example

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+# === Proxy (n150) ===
+# Agent connection
+AGENT_URL=http://192.168.1.50:48527
+AGENT_SECRET=change-me-to-a-strong-secret
+
+# UpSnap
+UPSNAP_URL=http://localhost:8090
+UPSNAP_USERNAME=admin
+UPSNAP_PASSWORD=admin
+UPSNAP_DEVICE_ID=your-device-id
+
+# Proxy settings
+PROXY_PORT=47391
+IDLE_TIMEOUT_MINUTES=15
+HEALTH_CHECK_INTERVAL_SECONDS=10
+WAKING_TIMEOUT_SECONDS=120
+
+# Services to proxy (JSON array)
+# Each: { "name": "Scriberr", "host": "scriberr.local", "target": "http://192.168.1.50:23636" }
+SERVICES='[{"name":"Scriberr","host":"scriberr.local","target":"http://192.168.1.50:23636"}]'
+
+# === Agent (PC) ===
+AGENT_PORT=48527
+AGENT_SECRET=change-me-to-a-strong-secret
+
+# Thresholds
+CPU_THRESHOLD_PERCENT=15
+GPU_THRESHOLD_PERCENT=10
+RAM_THRESHOLD_PERCENT=50
+DISK_IO_ACTIVE_THRESHOLD=true
+
+# Process watchlist (comma-separated)
+WATCHED_PROCESSES=hashcat,ffmpeg,whisper,python3,ollama
+
+# Shutdown command
+SHUTDOWN_COMMAND=systemctl poweroff