feat: full-field display for message/staff/accounts (raw_json + drawers)

Replicates the Customer all-fields pattern across the remaining three
entities. Backend now exposes `raw_json` on MessageOut / StaffOut /
AccountOut so the frontend can render every 云客 source field without a
second endpoint. Each entity gains a Chinese-label field utility + an
el-drawer surfacing all fields (structured-first, raw_json fallback,
unknown keys under 其他).

Backend:
- schemas.py: add `raw_json: dict | None` to MessageOut / StaffOut /
  AccountOut. MessageOut/StaffOut pick the column up via from_attributes;
  AccountOut is built explicitly in the router, which now threads
  `raw_json` through from both WechatAccount and WhatsappAccount rows.
- tests: new raw_json serialization tests for messages, staff, accounts
  (assert populated dict round-trips verbatim + NULL serializes as null).

Frontend (yunkes/):
- New utils: messageFields.ts, staffFields.ts, accountFields.ts — each
  with a 中文 label map, ordered groups, structured-column preference,
  and an 其他 fallback for unknown raw_json keys.
- Message: clicking a chat bubble opens an all-fields drawer (referMsg
  renders as pretty-printed JSON). Image preview + file download links
  stopPropagation so their own interactions still work.
- Staff: row click → drawer; columns relabeled (员工ID, 销售手机).
- Accounts: new AccountList.vue at /accounts with a 账号 nav item,
  unified WeChat/WhatsApp table (渠道/账号ID/昵称/微信号/归属员工/好友数/
  群数/收发/在职/最后更新), channel filter, pagination, row-click drawer.
- api: add Account type + getAccounts(); add raw_json to Message/Staff.

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

yunke-server/tests/test_api_messages.py

@@ -79,10 +79,86 @@ async def test_default_page_returns_all_ordered_asc(make_client):
         "sender_name",
         "sender_head_url",
         "timestamp",
+        "raw_json",
     ):
         assert key in body["items"][0]
 
 
+async def test_raw_json_serializes_verbatim(make_client):
+    """``raw_json`` round-trips the verbatim upstream message record.
+
+    The seeded messages omit ``raw_json`` (NULL); this test seeds one with a
+    populated blob and asserts every camelCase key is preserved verbatim while
+    the existing rows still serialize as ``null``.
+    """
+
+    async def seed(session: AsyncSession) -> None:
+        await _seed(session)
+        session.add(
+            Message(
+                msg_id="m_raw",
+                channel="wechat",
+                owner_account_id="wx_owner_1",
+                talker_id="t_a",
+                room_id=None,
+                type="image",
+                type_raw=3,
+                timestamp=5000,
+                raw_json={
+                    "msgSvrId": "m_raw",
+                    "type": 3,
+                    "file": "https://oss/full.jpg",
+                    "fileTh": "https://oss/th.jpg",
+                    "fileHd": "https://oss/hd.jpg",
+                    "md5": "abc123",
+                    "md5Th": "th123",
+                    "md5Hd": "hd123",
+                    "duration": 0,
+                    "talker": "t_a",
+                    "oriTalker": "t_a",
+                    "name": "Alice",
+                    "headUrl": "https://oss/alice.jpg",
+                    "wechatId": "wx_owner_1",
+                    "roomid": "",
+                    "isSend": 1,
+                    "paymsgid": "",
+                    "referMsg": {"text": "原文"},
+                },
+            )
+        )
+        await session.commit()
+
+    client = await make_client(seed)
+    r = await client.get("/api/messages", params={"talker_id": "t_a"})
+    assert r.status_code == 200
+    by_id = {it["msg_id"]: it for it in r.json()["items"]}
+
+    raw = by_id["m_raw"]["raw_json"]
+    assert raw == {
+        "msgSvrId": "m_raw",
+        "type": 3,
+        "file": "https://oss/full.jpg",
+        "fileTh": "https://oss/th.jpg",
+        "fileHd": "https://oss/hd.jpg",
+        "md5": "abc123",
+        "md5Th": "th123",
+        "md5Hd": "hd123",
+        "duration": 0,
+        "talker": "t_a",
+        "oriTalker": "t_a",
+        "name": "Alice",
+        "headUrl": "https://oss/alice.jpg",
+        "wechatId": "wx_owner_1",
+        "roomid": "",
+        "isSend": 1,
+        "paymsgid": "",
+        "referMsg": {"text": "原文"},
+    }
+
+    # Seeded messages without raw_json serialize as JSON null.
+    assert by_id["m1"]["raw_json"] is None
+
+
 async def test_filter_by_talker_id(make_client):
     """``?talker_id=t_a`` -> 2 messages for that 1:1 conversation."""
     client = await make_client(_seed)