fix(messages): 微信图片type=2映射漏掉(存成unknown前端不渲染)——补image映射+存量回填49504行

真机A**杰对话发现:新版云客图片走type=2且fileTh带完整OSS URL(旧映射只认
3=image_legacy)。存量回填:type_raw=2→image(49504行,其中47126带URL可渲染/
本地化)。A**杰对话实测图片正常显示(OSS直连渲染,本地化批后台进行中)

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

yunke-server/scripts/scrape_via_page.py

@@ -885,11 +885,23 @@ async def scrape_group_messages(cookie_str: str, max_groups: int = 500):
 
 
 def _normalize_msg_type(raw_type) -> str | None:
-    """Normalize a raw message type to our canonical type string."""
+    """Normalize a raw message type to our canonical type string.
+
+    微信 type=2 = 图片(新版,fileTh 带完整 OSS URL;真机 A**杰对话确认
+    2026-08-20——旧映射漏掉它导致图片被存成 unknown 前端不渲染)。
+    """
     if raw_type is None:
         return None
     t = str(raw_type)
-    mapping = {"1": "text", "3": "image_legacy", "34": "voice", "43": "video", "47": "emoji", "49": "file"}
+    mapping = {
+        "1": "text",
+        "2": "image",          # 新版图片(fileTh URL)
+        "3": "image_legacy",   # 旧版图片(md5/键)
+        "34": "voice",
+        "43": "video",
+        "47": "emoji",
+        "49": "file",
+    }
     return mapping.get(t, "unknown")