fix(security): CORS限制+SSRF防护+PATCH乐观锁+accounts安全cap(4 important bugs)

- main.py + config.py: CORS origins read from Settings.cors_origins (comma-separated).
  Empty falls back to dev origin localhost:5173; never wildcard. Methods locked
  to GET/PATCH/POST; allow_credentials=False.
- scraper/media.py: download_url now passes follow_redirects=False to httpx.
  OSS URLs return 200 directly; a 3xx is treated as a download failure (caught
  by existing except clauses) instead of opening an SSRF vector to internal hosts.
- routers/voice_clips.py: PATCH /voice-clips/{id}/match accepts an optional
  If-Match header carrying the client's last-seen updated_at. On mismatch the
  row was modified by another request and the server returns 409. Without the
  header the behaviour is unchanged (backward compatible). Response now echoes
  the post-update updated_at so the client can fold it into the next request.
- routers/organization.py: /api/accounts now UNION ALLs the wechat_account and
  whatsapp_account projections at the SQL level and pushes COUNT + pagination
  (offset/limit) down to the DB. Stable ordering on (channel, account_id).
  Removes the in-memory materialization that broke at scale.

Tests: 395 passed. Added optimistic-lock coverage (If-Match accepted / stale 409 /
absent header backward-compat). Updated existing PATCH tests for the new
updated_at response field.

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

yunke-server/app/api/routers/organization.py

@@ -10,9 +10,10 @@ Read-only queries over the mirrored ``department``, ``staff``,
 * ``GET /api/accounts`` -> ``Page[AccountOut]`` projecting both staff-messaging
   account tables onto a unified shape (see :class:`AccountOut`). The optional
   ``channel`` filter restricts to one of ``wechat`` / ``whatsapp``; when
-  omitted, both tables are unioned in memory. Staff-account volumes are modest
-  (tens to low hundreds of rows), so the in-memory merge is cheap and keeps
-  the API contract simple.
+  omitted, both tables are UNIONed at the SQL level and paginated in-database
+  (no full-table Python materialization). Staff-account volumes are modest in
+  practice today, but the SQL-level pagination keeps the endpoint safe if a
+  tenant ever scales past thousands of rows.
 """
 
 from __future__ import annotations
@@ -91,49 +92,80 @@ async def list_accounts(
     """List staff messaging accounts (WeChat / WhatsApp) in a unified shape.
 
     ``channel`` optional; one of ``wechat`` / ``whatsapp``. When omitted, both
-    tables are merged in memory. Pagination is applied after the merge using a
-    stable ``(channel, account_id)`` ordering.
+    tables are UNIONed at the SQL level. Pagination and total count are pushed
+    down to the database (single ``COUNT(*)`` over the UNION subquery + a
+    paginated ``SELECT`` with ``OFFSET``/``LIMIT``) so we never materialize the
+    full cross-table row set in Python. Stable ordering is ``(channel,
+    account_id)``.
+
+    ``AccountOut`` field mapping (identical shape from both source tables):
+
+    * WeChat: account_id=wx_id, nickname=nick_name, user_id, user_name, phone,
+      contacts_num, group_num, is_on_job, raw_json (verbatim upstream record).
+    * WhatsApp: account_id=uid (+ same projection).
     """
-    selected_channels = [channel] if channel else ["wechat", "whatsapp"]
+    wechat_q = sa.select(
+        WechatAccount.wx_id.label("account_id"),
+        sa.literal("wechat").label("channel"),
+        WechatAccount.nick_name.label("nickname"),
+        WechatAccount.user_id.label("user_id"),
+        WechatAccount.user_name.label("user_name"),
+        WechatAccount.phone.label("phone"),
+        WechatAccount.contacts_num.label("contacts_num"),
+        WechatAccount.group_num.label("group_num"),
+        WechatAccount.is_on_job.label("is_on_job"),
+        WechatAccount.raw_json.label("raw_json"),
+    )
+    whatsapp_q = sa.select(
+        WhatsappAccount.uid.label("account_id"),
+        sa.literal("whatsapp").label("channel"),
+        WhatsappAccount.nick_name.label("nickname"),
+        WhatsappAccount.user_id.label("user_id"),
+        WhatsappAccount.user_name.label("user_name"),
+        WhatsappAccount.phone.label("phone"),
+        WhatsappAccount.contacts_num.label("contacts_num"),
+        WhatsappAccount.group_num.label("group_num"),
+        WhatsappAccount.is_on_job.label("is_on_job"),
+        WhatsappAccount.raw_json.label("raw_json"),
+    )
 
-    rows: list[AccountOut] = []
-    if "wechat" in selected_channels:
-        result = (await session.execute(sa.select(WechatAccount))).scalars().all()
-        for r in result:
-            rows.append(
-                AccountOut(
-                    channel="wechat",
-                    account_id=r.wx_id,
-                    nickname=r.nick_name,
-                    user_id=r.user_id,
-                    user_name=r.user_name,
-                    phone=r.phone,
-                    contacts_num=r.contacts_num,
-                    group_num=r.group_num,
-                    is_on_job=r.is_on_job,
-                    raw_json=r.raw_json,
-                )
-            )
-    if "whatsapp" in selected_channels:
-        result = (await session.execute(sa.select(WhatsappAccount))).scalars().all()
-        for r in result:
-            rows.append(
-                AccountOut(
-                    channel="whatsapp",
-                    account_id=r.uid,
-                    nickname=r.nick_name,
-                    user_id=r.user_id,
-                    user_name=r.user_name,
-                    phone=r.phone,
-                    contacts_num=r.contacts_num,
-                    group_num=r.group_num,
-                    is_on_job=r.is_on_job,
-                    raw_json=r.raw_json,
-                )
-            )
+    if channel == "wechat":
+        parts: list[sa.Select] = [wechat_q]
+    elif channel == "whatsapp":
+        parts = [whatsapp_q]
+    else:
+        parts = [wechat_q, whatsapp_q]
 
-    rows.sort(key=lambda a: (a.channel, a.account_id))
-    total = len(rows)
-    start = (page - 1) * page_size
-    items = rows[start : start + page_size]
+    base_q: sa.Select = parts[0] if len(parts) == 1 else sa.union_all(*parts)
+
+    # Wrap in a subquery so COUNT and paginated SELECT both have a stable
+    # column set (the labelled columns become ``sub.c.<label>``).
+    sub = base_q.subquery()
+
+    total = (
+        await session.execute(sa.select(sa.func.count()).select_from(sub))
+    ).scalar_one()
+
+    page_q = (
+        sa.select(sub)
+        .order_by(sub.c.channel.asc(), sub.c.account_id.asc())
+        .offset((page - 1) * page_size)
+        .limit(page_size)
+    )
+    rows = (await session.execute(page_q)).all()
+    items = [
+        AccountOut(
+            channel=row.channel,
+            account_id=row.account_id,
+            nickname=row.nickname,
+            user_id=row.user_id,
+            user_name=row.user_name,
+            phone=row.phone,
+            contacts_num=row.contacts_num,
+            group_num=row.group_num,
+            is_on_job=row.is_on_job,
+            raw_json=row.raw_json,
+        )
+        for row in rows
+    ]
     return Page(items=items, total=total, page=page, page_size=page_size)