feat(scheduler): add scheduled jobs with channel-aware delivery

Introduce persisted cron/interval jobs, gateway scheduler loop, worker turns,
and admin CRUD/edit UI. Route proactive reminders via the originating chat
channel (WhatsApp vs WeChat), harden Weixin outbound with durable queue and
PG-compatible polling, and fix chat UI to show each scheduled reminder separately.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_schedule_duration_parse.py

@@ -0,0 +1,20 @@
+from __future__ import annotations
+
+import unittest
+
+from runtime.application.gateway.inbound_service import _parse_schedule_duration_seconds
+
+
+class ScheduleDurationParseTests(unittest.TestCase):
+    def test_minutes(self) -> None:
+        self.assertEqual(_parse_schedule_duration_seconds("5分钟"), 300)
+
+    def test_hours(self) -> None:
+        self.assertEqual(_parse_schedule_duration_seconds("1小时"), 3600)
+
+    def test_seconds(self) -> None:
+        self.assertEqual(_parse_schedule_duration_seconds("120秒"), 120)
+
+
+if __name__ == "__main__":
+    unittest.main()