feat: 添加开机自启动功能和用户指引界面

- 新增开机自启动功能，使用SMAppService实现
- 添加用户首次使用指引界面，包含功能介绍和权限说明
- 更新菜单栏选项，增加自启动开关和查看指南按钮
- 添加应用权限配置文件PowerBar.entitlements
- 创建README文档和.gitignore文件

.gitignore

@@ -0,0 +1,98 @@
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, too
+
+## Build generated
+build/
+DerivedData/
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Various settings
+*.pbxproj
+*.xccheckout
+*.moved-aside
+*.xcuserstate
+*.xcscmblueprint
+*.xccheckout
+
+## Other
+*.moved-aside
+*.xcuserstate
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## CocoaPods
+Pods/
+Podfile.lock
+
+## Carthage
+Carthage/Build/
+
+## fastlane
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+
+## Bundle artifact
+*.jsbundle
+
+## External dependencies
+*.framework
+*.a
+*.dylib
+
+## App Store submission
+*.ipa
+*.app.dSYM.zip
+*.app.dSYM
+
+## Local testing
+*.xcodeproj/xcshareddata/xcschemes/
+*.xcodeproj/project.xcworkspace/xcuserdata/
+
+# macOS
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must be in root
+!Icon?
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# PowerBar specific
+PowerBar.xcarchive/
+ExportedApp/
+PowerBar.dmg
+ExportOptions.plist