fix: 协调本地插件与绑定仓库的版本选择 (#6482)

* fix(plugin): reconcile local and bound payload versions

* fix(plugin): preserve bound source on updates

* fix(plugin): normalize source reconciliation ids

* fix(plugin): defer local payload activation

* fix(plugin): centralize startup source admission

* fix(plugin): derive sync mode from admitted source

app/api/endpoints/plugin.py

@@ -669,7 +669,7 @@ async def install(
     """
     result = await get_plugin_install_service().install(
         plugin_id=plugin_id,
-        repo_url=None,
+        repo_url=repo_url or None,
         release_version=release_version,
         force=bool(force),
         explicit_source=False,