feat(plugin): implement canvas node plugin system with dynamic registration and remote installation

web/src/vite-env.d.ts

@@ -2,3 +2,8 @@
 
 declare const __APP_VERSION__: string;
 declare const __APP_RELEASES__: import("@/lib/release").ReleaseInfo[];
+
+interface ImportMetaEnv {
+    // 逗号分隔的本地开发插件 URL,每次启动重新拉取(不缓存、不落库)
+    readonly VITE_DEV_PLUGINS?: string;
+}