feat: 修复 H5 底部导航覆盖 + 更新项目进度文档

## H5 底部导航修复 (Bug #10)
- 精简 App.vue，移除重复 tabbar，仅保留全局样式
- uni-page 设置 height: calc(100% - 50px) + overflow-y: auto
- 内容区域精确停在底部导航上方，独立滚动不再叠加
- 恢复 custom-tab-bar 组件

## 项目进度文档
- PROGRESS.md 更新至 10 个 Bug 修复
- 新增 H5 底部导航修复记录
- 新增历史变更条目

backend/app/services/whatsapp.py

@@ -85,6 +85,48 @@ class WhatsAppService:
             )
             return resp.status_code == 200
 
+    async def send_media(self, to: str, media_url: str, media_type: str = "image", caption: Optional[str] = None) -> bool:
+        if not self.api_token or not self.phone_number_id:
+            return False
+
+        body = {
+            "messaging_product": "whatsapp",
+            "to": to,
+            "type": media_type,
+            media_type: {"link": media_url},
+        }
+        if caption:
+            body[media_type]["caption"] = caption
+
+        async with httpx.AsyncClient() as client:
+            resp = await client.post(
+                f"{self.api_base}/messages",
+                headers={"Authorization": f"Bearer {self.api_token}", "Content-Type": "application/json"},
+                json=body,
+                timeout=30,
+            )
+            if resp.status_code != 200:
+                logger.error(f"WhatsApp media send failed: {resp.text}")
+                return False
+            return True
+
+    async def mark_as_read(self, message_id: str) -> bool:
+        if not self.api_token:
+            return False
+
+        async with httpx.AsyncClient() as client:
+            resp = await client.post(
+                f"{self.api_base}/messages",
+                headers={"Authorization": f"Bearer {self.api_token}", "Content-Type": "application/json"},
+                json={
+                    "messaging_product": "whatsapp",
+                    "status": "read",
+                    "message_id": message_id,
+                },
+                timeout=10,
+            )
+            return resp.status_code == 200
+
     def parse_webhook(self, body: Dict) -> Optional[Dict]:
         try:
             entry = body.get("entry", [{}])[0]
@@ -96,14 +138,29 @@ class WhatsAppService:
                 return None
 
             msg = messages[0]
+            msg_type = msg.get("type", "text")
+            content = ""
+
+            if msg_type == "text":
+                content = msg.get("text", {}).get("body", "")
+            elif msg_type in ("image", "document", "audio", "video"):
+                media = msg.get(msg_type, {})
+                content = media.get("caption", "") or media.get("filename", "") or f"[{msg_type}]"
+
             return {
                 "from": msg.get("from"),
-                "text": msg.get("text", {}).get("body", ""),
+                "text": content,
                 "msg_id": msg.get("id"),
                 "timestamp": msg.get("timestamp"),
-                "type": msg.get("type", "text"),
+                "type": msg_type,
                 "profile_name": value.get("contacts", [{}])[0].get("profile", {}).get("name"),
             }
         except Exception as e:
             logger.warning(f"Failed to parse WhatsApp webhook: {e}")
             return None
+
+    def _build_headers(self) -> Dict[str, str]:
+        return {
+            "Authorization": f"Bearer {self.api_token}",
+            "Content-Type": "application/json",
+        }