feat: Enhance UserScript structure and functionality

- Updated package.json to include new scripts for development, production builds, linting, formatting, and cleaning.
- Added ESLint and Prettier for code quality and formatting.
- Refactored main application class to extend EventEmitter and manage modules.
- Introduced ExampleModule to demonstrate module structure and functionality.
- Created utility classes for DOM manipulation, event handling, and persistent storage.
- Added TypeScript definitions for UserScript environment.
- Improved TypeScript configuration with stricter checks and path aliases.
- Updated Vite configuration to handle development and production builds more effectively.
- Enhanced user script header generation to support environment-specific configurations.

src/utils/storage.ts

@@ -0,0 +1,61 @@
+/**
+ * Storage utility for UserScript persistent data
+ */
+export class Storage {
+  /**
+   * Set a value in persistent storage
+   */
+  static set<T>(key: string, value: T): void {
+    try {
+      const serialized = JSON.stringify(value);
+      GM_setValue(key, serialized);
+    } catch (error) {
+      console.error(`Failed to store value for key "${key}":`, error);
+    }
+  }
+
+  /**
+   * Get a value from persistent storage
+   */
+  static get<T>(key: string, defaultValue?: T): T | undefined {
+    try {
+      const stored = GM_getValue(key);
+      if (stored === undefined) {
+        return defaultValue;
+      }
+      return JSON.parse(stored) as T;
+    } catch (error) {
+      console.error(`Failed to retrieve value for key "${key}":`, error);
+      return defaultValue;
+    }
+  }
+
+  /**
+   * Remove a value from persistent storage
+   */
+  static remove(key: string): void {
+    GM_deleteValue(key);
+  }
+
+  /**
+   * Check if a key exists in storage
+   */
+  static has(key: string): boolean {
+    return GM_getValue(key) !== undefined;
+  }
+
+  /**
+   * Get all keys from storage
+   */
+  static getAllKeys(): string[] {
+    return GM_listValues();
+  }
+
+  /**
+   * Clear all storage (use with caution!)
+   */
+  static clear(): void {
+    const keys = GM_listValues();
+    keys.forEach(key => GM_deleteValue(key));
+  }
+}