refactor(repo): replace legacy openflare-server with Wavelet rename

Delete the old monolithic openflare-server implementation and rename
Wavelet/ to openflare-server/ to complete the migration consolidation.
Update CI workflows, agent Dockerfiles, and deployment docs for the new
layout (frontend/, docker/Dockerfile).

openflare-server/frontend/lib/theme/index.ts

@@ -0,0 +1,19 @@
+/**
+ * 主题系统
+ * 统一导出整个主题系统的所有功能
+ */
+
+/* 类型定义 */
+export type { Theme, ThemeColors, ThemeConfig } from "./types"
+
+/* 配置 */
+export { THEME_CONFIG } from "./config"
+
+/* 服务端工具 */
+export { getAvailableThemes } from "./parser"
+
+/* 客户端工具 */
+export { getStoredThemeId, setStoredThemeId, removeStoredThemeId } from "./storage"
+
+/* React 上下文和 Hooks */
+export { CustomThemeProvider, useCustomTheme } from "./context"