fix: preserve legacy plugin catalogs and protect helper token initialization

artemis/plugins/installer.py

@@ -44,10 +44,11 @@ def download(url: str, progress: Callable[[str, int], None]) -> bytes:
 
 def load_catalog() -> PluginCatalog:
     url = settings.ARTEMIS_PLUGIN_MARKETPLACE_URL
-    # Older hosts reject schema-v3 entries before checking version constraints.
-    # Keep their index intact, and route only the exact former official URL.
-    if url == "https://git.playones.com/chenmingxuan/Artemis-Plugins/raw/branch/main/catalog.json":
-        url = url.removesuffix("catalog.json") + "catalog-v3.json"
+    # Strict older hosts cannot parse newer panel kinds, even if incompatible.
+    # Preserve their indexes; upgrade only the exact official saved addresses.
+    official = "https://git.playones.com/chenmingxuan/Artemis-Plugins/raw/branch/main/"
+    if url in {official + "catalog.json", official + "catalog-v3.json"}:
+        url = official + "catalog-v4.json"
     data = download(url, lambda *_: None)
     if len(data) > 2 * 1024 * 1024:
         raise ValueError("市场索引过大")