feat: add automation, reminders, notifications, msg search, session export, image analysis, host exec, PWA, Docker, E2E, CI/CD

- Automation: rules CRUD (in-memory store + API)
- Reminders: CRUD (in-memory store + API)
- Notifications: push interface for future push server
- Message search: API endpoint with DB-backed query
- Session export: /sessions/:id/export → Markdown
- Image analysis: API stub for multimodal LLM
- Host exec: API stub for Docker sandbox
- PWA: manifest.json + service worker
- Docker: Dockerfile + docker-compose.yml
- E2E: Playwright test scaffold
- CI/CD: GitHub Actions workflow (go test + tsc)

frontend/web/public/manifest.json

@@ -0,0 +1,12 @@
+{
+  "name": "Cyrene",
+  "short_name": "Cyrene",
+  "description": "LLM-powered AI companion platform",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#242424",
+  "theme_color": "#3482FF",
+  "icons": [
+    { "src": "/images/cyrene-avatar.png", "sizes": "512x512", "type": "image/png" }
+  ]
+}