refactor: migrate workflow actions to runtime config snapshot

tests/fixtures/architecture/configuration-debt-baseline.json

@@ -9,7 +9,7 @@
     "root": "app"
   },
   "settings_imports": {
-    "count": 130,
+    "count": 127,
     "files": [
       "app/adapters/cache/backends.py",
       "app/adapters/cache/redis.py",
@@ -136,10 +136,7 @@
       "app/startup/modules_initializer.py",
       "app/startup/plugins_initializer.py",
       "app/startup/routers_initializer.py",
-      "app/workflow/actions/add_subscribe.py",
       "app/workflow/actions/fetch_medias.py",
-      "app/workflow/actions/fetch_rss.py",
-      "app/workflow/actions/scan_file.py",
       "app/workflow/actions/send_message.py"
     ]
   },

tests/test_workflow_runtime_config.py

@@ -0,0 +1,131 @@
+from datetime import datetime
+from types import SimpleNamespace
+
+from app.application.configuration import ChainRuntimeConfig
+from app.schemas import ActionContext
+from app.schemas.context import MediaInfo
+from app.schemas.types import MediaType
+from app.workflow.actions.add_subscribe import AddSubscribeAction
+from app.workflow.actions.fetch_rss import FetchRssAction
+from app.workflow.actions.scan_file import ScanFileAction
+from app.workflow.actions import add_subscribe as add_subscribe_module
+from app.workflow.actions import fetch_rss as fetch_rss_module
+from app.workflow.actions import scan_file as scan_file_module
+
+
+def _runtime_config(**overrides):
+    """构造仅覆盖测试关注字段的 Chain 配置快照。"""
+    values = {
+        "media_extensions": (".mkv",),
+        "subtitle_extensions": (".srt",),
+        "audio_extensions": (".flac",),
+        "superuser": "snapshot-admin",
+        "proxy": {"https": "http://snapshot-proxy:7890"},
+    }
+    values.update(overrides)
+    return ChainRuntimeConfig(**values)
+
+
+def test_fetch_rss_reads_proxy_from_chain_snapshot(monkeypatch):
+    """RSS 动作应使用一次 Chain 快照中的代理，而不是全局 settings。"""
+    captured = {}
+
+    class FakeRssHelper:
+        """记录 RSS 请求参数的测试替身。"""
+
+        def parse(self, **kwargs):
+            captured.update(kwargs)
+            return [{
+                "title": "Example",
+                "enclosure": "https://example.com/example.torrent",
+                "link": "https://example.com/details",
+                "size": 1,
+                "pubdate": datetime(2026, 1, 1),
+            }]
+
+    monkeypatch.setattr(fetch_rss_module, "RssHelper", FakeRssHelper)
+    monkeypatch.setattr(
+        fetch_rss_module,
+        "get_chain_runtime_config_snapshot",
+        lambda: _runtime_config(),
+    )
+    monkeypatch.setattr(fetch_rss_module.global_vars, "is_workflow_stopped", lambda _: False)
+
+    FetchRssAction("rss").execute(
+        workflow_id=1,
+        params={"url": "https://example.com/rss.xml", "proxy": True},
+        context=ActionContext(),
+    )
+
+    assert captured["proxy"] == {"https": "http://snapshot-proxy:7890"}
+
+
+def test_scan_file_filters_extensions_from_chain_snapshot(monkeypatch):
+    """扫描动作应按快照后缀集合筛选媒体文件。"""
+
+    class FakeStorageChain:
+        """返回固定文件列表的存储链测试替身。"""
+
+        def get_file_item(self, storage, directory):
+            return SimpleNamespace(storage=storage, path=str(directory))
+
+        def list_files(self, fileitem, recursion=True):
+            return [
+                SimpleNamespace(extension="mkv"),
+                SimpleNamespace(extension="txt"),
+                SimpleNamespace(extension="srt"),
+            ]
+
+    monkeypatch.setattr(scan_file_module, "StorageChain", FakeStorageChain)
+    monkeypatch.setattr(
+        scan_file_module,
+        "get_chain_runtime_config_snapshot",
+        lambda: _runtime_config(),
+    )
+    monkeypatch.setattr(scan_file_module.global_vars, "is_workflow_stopped", lambda _: False)
+
+    context = ScanFileAction("scan").execute(
+        workflow_id=1,
+        params={"storage": "local", "directory": "/library"},
+        context=ActionContext(),
+    )
+
+    assert [item.extension for item in context.fileitems] == ["mkv", "srt"]
+
+
+def test_add_subscribe_uses_superuser_from_chain_snapshot(monkeypatch):
+    """添加订阅动作应将快照中的超级管理员传给订阅链。"""
+    captured = {}
+
+    class FakeSubscribeChain:
+        """记录订阅新增参数的测试替身。"""
+
+        def exists(self, _mediainfo):
+            return False
+
+        def add(self, **kwargs):
+            captured.update(kwargs)
+            return 42, "ok"
+
+    monkeypatch.setattr(add_subscribe_module, "SubscribeChain", FakeSubscribeChain)
+    monkeypatch.setattr(
+        add_subscribe_module,
+        "get_chain_runtime_config_snapshot",
+        lambda: _runtime_config(superuser="snapshot-owner"),
+    )
+    monkeypatch.setattr(add_subscribe_module.global_vars, "is_workflow_stopped", lambda _: False)
+    monkeypatch.setattr(
+        add_subscribe_module,
+        "SubscribeOper",
+        lambda: SimpleNamespace(get=lambda sid: sid),
+    )
+
+    AddSubscribeAction("subscribe").execute(
+        workflow_id=1,
+        params={},
+        context=ActionContext(
+            medias=[MediaInfo(type=MediaType.MOVIE, title="Example", year="2026")]
+        ),
+    )
+
+    assert captured["username"] == "snapshot-owner"