refactor: simplify plugin dependency handling

Simplify plugin installation and runtime loading around package-manager-owned dependencies, with Jiti reserved for local/TS fallback paths.

Also scans npm plugin install roots so hoisted transitive dependencies are covered by dependency denylist and node_modules symlink checks.

extensions/feishu/package.json

@@ -48,9 +48,6 @@
     "build": {
       "openclawVersion": "2026.4.25"
     },
-    "bundle": {
-      "stageRuntimeDependencies": true
-    },
     "release": {
       "publishToClawHub": true,
       "publishToNpm": true