Initial commit: FlipClockSaver macOS screen saver

- 翻页时钟屏保，纯 Core Graphics 手绘、无黑缝翻页动画
- 支持公历日期 / 农历（天干地支+生肖）显示
- 设置面板：整体缩放、显示日期、显示农历
- 跨进程设置同步（直写 plist 绕过 cfprefsd 缓存）

.gitignore

@@ -0,0 +1,23 @@
+# macOS
+.DS_Store
+
+# Xcode user state (per-machine, never commit)
+*.xcuserstate
+xcuserdata/
+UserInterfaceState.xcuserstate
+
+# Build artifacts
+build/
+DerivedData/
+*.hmap
+*.ipa
+*.xcarchive
+*.dSYM.zip
+*.dSYM
+
+# WorkBuddy internal memory (tool data, not project source)
+.workbuddy/
+
+# Editor / OS junk
+*.swp
+*~