refactor(scheduler): 缓存清理改为仅手动执行

移除 clear_cache 的 add_job 注册，不再自动定时执行。
在 _jobs 中标记 manual=True 并补充 provider_name，
list() 新增手动任务展示段，未调度的手动任务也能在 UI 中显示和手动触发。

app/scheduler.py

@@ -475,7 +475,9 @@ class Scheduler(ConfigReloadMixin, metaclass=SingletonClass):
                 "clear_cache": {
                     "name": "缓存清理",
                     "func": self.clear_cache,
+                    "provider_name": "[系统]",
                     "running": False,
+                    "manual": True,
                 },
                 "data_cleanup": {
                     "name": "数据表清理",
@@ -682,16 +684,6 @@ class Scheduler(ConfigReloadMixin, metaclass=SingletonClass):
                 kwargs={"job_id": "scheduler_job"},
             )
 
-            # 缓存清理服务
-            self._scheduler.add_job(
-                self.start,
-                "interval",
-                id="clear_cache",
-                name="缓存清理",
-                hours=24,
-                kwargs={"job_id": "clear_cache"},
-            )
-
             # 数据表清理服务，每天凌晨执行一次
             if settings.DATA_CLEANUP_ENABLE:
                 self._scheduler.add_job(
@@ -1524,6 +1516,26 @@ class Scheduler(ConfigReloadMixin, metaclass=SingletonClass):
                         progress_detail=progress,
                     )
                 )
+            # 仅手动执行的任务（未注册到调度器）
+            for job_id, service in self._jobs.items():
+                if not service.get("manual"):
+                    continue
+                if job_id in added:
+                    continue
+                added.append(job_id)
+                progress = self.get_progress(job_id)
+                schedulers.append(
+                    schemas.ScheduleInfo(
+                        id=job_id,
+                        name=service.get("name"),
+                        provider=service.get("provider_name", "[系统]"),
+                        status="等待",
+                        progress=progress.value if progress else 0,
+                        progress_text=progress.text if progress else None,
+                        progress_enable=progress.enable if progress else False,
+                        progress_detail=progress,
+                    )
+                )
             return schedulers
 
     def stop(self):