refactor: reorganize directory structure into src/

Move all source code directories into src/ for cleaner project structure:
- pages/, components/, utils/, config/, providers/, types/, lib/, assets/, entrypoints/ → src/
- Use WXT srcDir config to resolve @/ alias to src/
- Update tsconfig, vitest, eslint, tailwind configs
- Remove scattered README.md files from subdirectories
- Update documentation (AGENTS.md, CODING_STANDARDS.md, README.md)
- Fix pre-existing lint error in RouterProvider.tsx

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/utils/contextMenu.ts

@@ -0,0 +1,123 @@
+import type { PageType } from '@/types/storage';
+
+export interface ContextMenuItemConfig {
+  id: string;
+  title: string;
+  contexts: [`${chrome.contextMenus.ContextType}`, ...`${chrome.contextMenus.ContextType}`[]];
+  parentId?: string;
+}
+
+export interface ContextMenuClickedInfo {
+  featureKey: PageType;
+  payload: string;
+}
+
+export interface ParseResult {
+  success: boolean;
+  data?: ContextMenuClickedInfo;
+  error?: string;
+}
+
+const PARENT_MENU_ID = 'testing-tools-parent';
+
+export const MAX_PAYLOAD_LENGTH = 10000;
+
+/** 菜单项 ID 到 PageType 的映射（仅处理非常规映射） */
+const MENU_ID_TO_PAGE_TYPE: Record<string, PageType> = {
+  'qrCode-page': 'qrCode',
+};
+
+/**
+ * 将菜单项 ID 转换为 PageType
+ * 如果存在显式映射则使用映射，否则直接使用 menuItemId
+ */
+function getMenuPageType(menuItemId: string): PageType {
+  return MENU_ID_TO_PAGE_TYPE[menuItemId] ?? (menuItemId as PageType);
+}
+
+export const CONTEXT_MENU_CONFIGS: ContextMenuItemConfig[] = [
+  {
+    id: PARENT_MENU_ID,
+    title: 'Testing Tools',
+    contexts: [chrome.contextMenus.ContextType.ALL],
+  },
+  {
+    id: 'jwt',
+    title: '🔑 解析 JWT',
+    contexts: [chrome.contextMenus.ContextType.SELECTION],
+    parentId: PARENT_MENU_ID,
+  },
+  {
+    id: 'base64Converter',
+    title: '🔄 Base64 解码',
+    contexts: [chrome.contextMenus.ContextType.SELECTION],
+    parentId: PARENT_MENU_ID,
+  },
+  {
+    id: 'textStatistics',
+    title: '📊 统计选中文本',
+    contexts: [chrome.contextMenus.ContextType.SELECTION],
+    parentId: PARENT_MENU_ID,
+  },
+  {
+    id: 'timestamp',
+    title: '⏰ 转换时间戳',
+    contexts: [chrome.contextMenus.ContextType.SELECTION],
+    parentId: PARENT_MENU_ID,
+  },
+  {
+    id: 'storageCleaner',
+    title: '🧹 清理当前网站存储',
+    contexts: [chrome.contextMenus.ContextType.PAGE],
+    parentId: PARENT_MENU_ID,
+  },
+  {
+    id: 'qrCode-page',
+    title: '🔗 网页链接转二维码',
+    contexts: [chrome.contextMenus.ContextType.PAGE],
+    parentId: PARENT_MENU_ID,
+  },
+];
+
+export function createAllContextMenus(): void {
+  for (const config of CONTEXT_MENU_CONFIGS) {
+    chrome.contextMenus.create({
+      id: config.id,
+      title: config.title,
+      contexts: config.contexts,
+      parentId: config.parentId,
+    });
+  }
+}
+
+export function parseContextMenuClick(
+  menuItemId: string,
+  info: chrome.contextMenus.OnClickData,
+): ParseResult {
+  const featureKey = getMenuPageType(menuItemId);
+
+  if (info.selectionText) {
+    const text = info.selectionText;
+
+    if (text.length > MAX_PAYLOAD_LENGTH) {
+      return {
+        success: true,
+        data: { featureKey, payload: text.substring(0, MAX_PAYLOAD_LENGTH) },
+      };
+    }
+
+    return {
+      success: true,
+      data: { featureKey, payload: text },
+    };
+  }
+
+  if (info.pageUrl) {
+    return {
+      success: true,
+      data: { featureKey, payload: info.pageUrl },
+    };
+  }
+
+  return { success: false, error: '无法获取有效数据' };
+}