feat(notification): support Server酱³ sendkeys (#904)

sctp<uid>t-prefixed sendkeys route to the Server酱³ endpoint
(https://<uid>.push.ft07.com/send/<key>.send); Turbo keys keep the
legacy sctapi.ftqq.com endpoint.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Pz1EmcTPzjgEpkGQWzb8AQ

backend/src/module/notification/providers/server_chan.py

@@ -1,6 +1,7 @@
 """Server Chan notification provider."""
 
 import logging
+import re
 from typing import TYPE_CHECKING
 
 from module.models.bangumi import Notification
@@ -11,6 +12,9 @@ if TYPE_CHECKING:
 
 logger = logging.getLogger(__name__)
 
+# Server酱³ 的 sendkey 形如 sctp<uid>t<key>，推送端点与 Turbo 版不同 (#904)
+_SC3_KEY_RE = re.compile(r"^sctp(\d+)t")
+
 
 class ServerChanProvider(NotificationProvider):
     """Server Chan (Server酱) notification provider for WeChat."""
@@ -18,7 +22,13 @@ class ServerChanProvider(NotificationProvider):
     def __init__(self, config: "ProviderConfig"):
         super().__init__(config)
         token = config.token
-        self.notification_url = f"https://sctapi.ftqq.com/{token}.send"
+        sc3 = _SC3_KEY_RE.match(token)
+        if sc3:
+            self.notification_url = (
+                f"https://{sc3.group(1)}.push.ft07.com/send/{token}.send"
+            )
+        else:
+            self.notification_url = f"https://sctapi.ftqq.com/{token}.send"
 
     async def send(self, notification: Notification) -> bool:
         """Send notification via Server Chan."""

backend/src/test/test_notification.py

@@ -616,6 +616,28 @@ class TestDeliverText:
         assert data["title"] == "标题"
         assert data["desp"] == "正文"
 
+    def test_server_chan_legacy_key_uses_sctapi_endpoint(self):
+        config = ProviderConfig(type="server-chan", enabled=True, token="SCT123abc")
+        provider = ServerChanProvider(config)
+
+        assert provider.notification_url == "https://sctapi.ftqq.com/SCT123abc.send"
+
+    def test_server_chan_sc3_key_uses_ft07_endpoint(self):
+        """Server酱³ 的 sendkey 以 sctp<uid>t 开头，走 push.ft07.com 端点 (#904)。"""
+        config = ProviderConfig(type="server-chan", enabled=True, token="sctp456tXYZ")
+        provider = ServerChanProvider(config)
+
+        assert (
+            provider.notification_url
+            == "https://456.push.ft07.com/send/sctp456tXYZ.send"
+        )
+
+    def test_server_chan_malformed_sctp_key_falls_back_to_legacy(self):
+        config = ProviderConfig(type="server-chan", enabled=True, token="sctpXYZ")
+        provider = ServerChanProvider(config)
+
+        assert provider.notification_url == "https://sctapi.ftqq.com/sctpXYZ.send"
+
     async def test_telegram_deliver_text_posts_combined_text(self):
         config = ProviderConfig(
             type="telegram", enabled=True, token="test_token", chat_id="12345"