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/app/api/schemas.py

@@ -68,7 +68,12 @@ class DepartmentOut(BaseModel):
 
 
 class StaffOut(BaseModel):
-    """Staff member (employee) row."""
+    """Staff member (employee) row.
+
+    The structured columns power the list table; the verbatim upstream record
+    is exposed as ``raw_json`` so the frontend can render the all-fields drawer
+    without a second endpoint. Picked up automatically via ``from_attributes``.
+    """
 
     model_config = ConfigDict(from_attributes=True)
 
@@ -78,6 +83,7 @@ class StaffOut(BaseModel):
     sale_phone: str | None = None
     dept_id: str | None = None
     is_on_job: bool | None = None
+    raw_json: dict[str, Any] | None = None
 
 
 class AccountOut(BaseModel):
@@ -87,7 +93,9 @@ class AccountOut(BaseModel):
     have different PK / column names; this view projects both onto a single
     shape keyed by ``channel`` + ``account_id`` so the frontend can render one
     list. Built explicitly in the route handler (not via ``from_attributes``)
-    because no single ORM row carries this schema.
+    because no single ORM row carries this schema. ``raw_json`` carries the
+    verbatim upstream record (wechatId/alias/sendNum/receiveNum/dbSize/...) so
+    the all-fields drawer can render every column the 云客 微信号管理 page shows.
     """
 
     channel: str
@@ -99,6 +107,7 @@ class AccountOut(BaseModel):
     contacts_num: int | None = None
     group_num: int | None = None
     is_on_job: bool | None = None
+    raw_json: dict[str, Any] | None = None
 
 
 # ---------------------------------------------------------------------------
@@ -107,7 +116,14 @@ class AccountOut(BaseModel):
 
 
 class MessageOut(BaseModel):
-    """Chat timeline row — a single message (text/media/voice/...)."""
+    """Chat timeline row — a single message (text/media/voice/...).
+
+    The structured columns power the bubble rendering; the verbatim upstream
+    record is exposed as ``raw_json`` so the frontend can render the all-fields
+    drawer (msgSvrId/keyId, file/fileTh/fileHd, md5/md5Th/md5Hd, paymsgid,
+    referMsg, imgPath, ...) without a second endpoint. Picked up automatically
+    via ``from_attributes``.
+    """
 
     model_config = ConfigDict(from_attributes=True)
 
@@ -132,6 +148,7 @@ class MessageOut(BaseModel):
     sender_name: str | None = None
     sender_head_url: str | None = None
     timestamp: int | None = None
+    raw_json: dict[str, Any] | None = None
 
 
 class GroupOut(BaseModel):