feat: tasks app, security hardening, mobile fixes, iOS app shell

- Custom SQLite task manager replacing TickTick wrapper
- 73 tasks migrated from TickTick across 15 projects
- RRULE recurrence engine with lazy materialization
- Dashboard tasks widget (desktop sidebar + mobile card)
- Tasks page with project tabs, add/edit/complete/delete
- Security: locked ports to localhost, removed old containers
- Gitea Actions runner configured and all 3 CI jobs passing
- Fixed mobile overflow on dashboard cards
- iOS Capacitor app shell (Second Brain)
- Frontend/backend guide docs for adding new services
- TickTick Google Calendar sync re-authorized

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

mobile/ios/.gitignore

@@ -0,0 +1,13 @@
+App/build
+App/Pods
+App/output
+App/App/public
+DerivedData
+xcuserdata
+
+# Cordova plugins for Capacitor
+capacitor-cordova-ios-plugins
+
+# Generated Config files
+App/App/capacitor.config.json
+App/App/config.xml