Add JSDoc documentation and file headers to all source files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/types/env.d.ts

@@ -1,9 +1,23 @@
+// The Lucia project.
+// Copyright 2024-2026 DSP, inc.  All rights reserved.
+// Authors:
+//   cindy.chang@dsp.im (Cindy Chang), 2024/7/9
+/**
+ * @module types/env.d
+ *   Type declarations for Vite environment variables.
+ */
+
+/** Vite environment variable types. */
 interface ImportMetaEnv {
+    /** The application title. */
     readonly VITE_APP_TITLE: string;
+    /** The base URL for the application. */
     readonly BASE_URL: string;
-    // 更多環境變量...
+    // Add more environment variables as needed.
   }
-  
+
+  /** Augments ImportMeta with typed env. */
   interface ImportMeta {
+    /** The typed environment variables. */
     readonly env: ImportMetaEnv;
   }