Add network scan

memory/MEMORY.md

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+# Links Project Memory
+
+## Project: links (GoLinks + mini-apps)
+- Django + APScheduler + Tailwind + SQLite (local) / PostgreSQL (prod via DB_HOST env var)
+- Deployment: Docker → K3s at 192.168.1.2, namespace `home-apps`
+- Use `uv run manage.py` (not bare `python manage.py`) — greenlet/playwright has macOS code-signing issues locally
+- Templates extend `base.html` from `templates/base.html` (not app-level)
+- Scheduler singleton: `core.scheduler.scheduler` (BackgroundScheduler, already running from CoreConfig.ready)
+- App scheduler wiring pattern: import signals in AppConfig.ready(), wrap ORM calls in try/except
+
+## NetScan sub-app (implemented 2026-03-21)
+- Located at `netscan/`
+- 3 models: ScanProfile, ScanRun, ScanFinding
+- 6 check modules in `netscan/checks/`: router, dns, ingress, cameras, tls, ports
+- Scanner orchestrator: `netscan/scanner.run_scan(profile_id, triggered_by)`
+- Telegram notifications: `netscan/notifications.py` (raw requests, no library)
+- URL prefix: `/ui/netscan/`
+- Migration written manually (0001_initial.py) — local playwright/greenlet prevents running makemigrations