feat: 完成T-504更新执行增强

- 新增 dry-run、多账号并行和最大并行账号数设置

- 增加 run_logs/run_log_events 运行日志表及读写接口

- ApplyWorker 支持 dry-run 预览、按账号并行、端口冲突阻断和日志展示

- 补充 DB/GUI 单元测试并同步任务、架构、API、路由和当前状态文档

验证: python -m compileall app main.py tests; python -m unittest discover -s tests

tests/test_db.py

@@ -139,6 +139,54 @@ class DbTests(TempDirMixin, unittest.TestCase):
 
         self.assert_removed(temp_dir)
 
+    def test_run_logs_and_events_are_persisted(self):
+        with self.make_temp_dir() as temp_dir:
+            db_path = os.path.join(temp_dir, "cmshopee.db")
+            db.init_db(db_path)
+
+            run_id = db.create_run_log(
+                "apply",
+                dry_run=True,
+                total=2,
+                options={"api_key": "secret", "mode": "preview"},
+                path=db_path,
+            )
+            db.add_run_log_event(
+                run_id,
+                "dry-run 预览任务",
+                task_id=7,
+                alias="alias",
+                item_id="51100639510",
+                path=db_path,
+            )
+            db.finish_run_log(
+                run_id,
+                status="done",
+                done=2,
+                success_count=1,
+                skipped_count=1,
+                failed_count=0,
+                summary_json={"password": "secret", "done": 2},
+                path=db_path,
+            )
+
+            run = db.list_run_logs(path=db_path)[0]
+            self.assertEqual(run_id, run.id)
+            self.assertEqual("apply", run.run_type)
+            self.assertEqual(1, run.dry_run)
+            self.assertEqual("done", run.status)
+            self.assertEqual(2, run.done)
+            self.assertEqual("***", run.options["api_key"])
+            self.assertEqual("***", run.summary["password"])
+
+            events = db.list_run_log_events(run_id, path=db_path)
+            self.assertEqual(1, len(events))
+            self.assertEqual("alias", events[0].alias)
+            self.assertEqual("51100639510", events[0].item_id)
+            self.assertIn("dry-run", events[0].message)
+
+        self.assert_removed(temp_dir)
+
 
 if __name__ == "__main__":
     unittest.main()