feat: add bridge service for mini program web-view integration

- Implemented a bridge utility for sharing, copying links, and setting the navigation bar title in mini program web-view.
- Added methods for sharing content and copying links to clipboard.
- Included error handling for non-mini program environments.

frontend/src/app/services/bridge.ts

@@ -0,0 +1,82 @@
+/**
+ * 小程序 WebView 桥接工具
+ *
+ * 在 H5（app_03）中调用此工具，可实现分享、复制链接等功能。
+ * 小程序侧（crmeb web_view）通过 @message 监听处理。
+ *
+ * 使用方式：
+ *   import bridge from '../services/bridge'
+ *
+ *   // 分享给好友
+ *   bridge.share({ title: '标题', href: window.location.href })
+ *
+ *   // 复制链接
+ *   bridge.copyLink(window.location.href)
+ */
+
+declare const wx: any
+
+function getMiniProgram() {
+  try {
+    if (typeof wx !== 'undefined' && wx.miniProgram) {
+      return wx.miniProgram
+    }
+  } catch {
+    // ignore
+  }
+  return null
+}
+
+const bridge = {
+  postMessage(data: Record<string, any>) {
+    const mp = getMiniProgram()
+    if (mp) {
+      mp.postMessage({ data })
+    } else {
+      console.warn('[bridge] 不在小程序 web-view 环境中')
+    }
+  },
+
+  /**
+   * 分享给微信好友 / 朋友圈
+   */
+  share(opts: {
+    title: string
+    href?: string
+    summary?: string
+    imageUrl?: string
+    scene?: 'WXSceneSession' | 'WXSceneTimeline'
+  }) {
+    this.postMessage({
+      action: 'share',
+      title: opts.title || '',
+      href: opts.href || window.location.href,
+      summary: opts.summary || '',
+      imageUrl: opts.imageUrl || '',
+      scene: opts.scene || 'WXSceneSession',
+    })
+  },
+
+  /**
+   * 复制链接到剪贴板
+   */
+  copyLink(link?: string) {
+    this.postMessage({
+      action: 'copyLink',
+      href: link || window.location.href,
+    })
+  },
+
+  /**
+   * 设置小程序导航栏标题
+   */
+  setTitle(title: string) {
+    if (!title) return
+    this.postMessage({
+      action: 'setTitle',
+      title,
+    })
+  },
+}
+
+export default bridge