feat(background): implement user consent mechanism for auto-start functionality

Add auto-start consent system that requires explicit user permission before enabling background sync services. Users can now choose between silent mode (no auto-start) or background mode (15-minute sync intervals).

- Add consent service with AutoStartMode enum and storage utilities
- Create withRemoveAutoStart Expo plugin to disable Android auto-start defaults
- Integrate consent checks into JPush service, background task manager, and foreground service
- Add auto-start consent UI in notification settings with descriptive dialog
- Update privacy policy with section 8 explaining auto-start scenarios and user controls
- Change default sync mode from BATTERY_SAVER to DISABLED
- Export reinitBackgroundService function for re-initializing after consent changes
- Merge OTA Android and iOS workflows into matrix build
- Add release signing config in withSigning plugin for Android
- Expand .dockerignore with native credential and build artifact exclusions

.dockerignore

@@ -1,10 +1,40 @@
+# Dependencies
 node_modules
+
+# Source control
 .git
+.gitignore
+
+# Expo caches
 .expo
+.expo-shared
+
+# Build artifacts
 dist
 dist-web
 dist-android
+dist-ios
 dist-android-update.zip
-android 
+dist-ios-update.zip
+android
+ios
+web-build
+
+# Native credentials (never ship into image)
+*.jks
+*.p8
+*.p12
+*.key
+*.mobileprovision
+*.orig.*
+
+# Misc
 screenshots
 *.log
+.vscode
+.idea
+.DS_Store
+*.swp
+*.swo
+coverage
+__tests__