added hooks and plugins files missing

plugins/admin/__init__.py

@@ -0,0 +1,6 @@
+import click
+from flask import Flask
+
+def register_cli(app: Flask):
+    # No CLI commands yet for admin plugin
+    pass

plugins/admin/plugin.json

@@ -0,0 +1,6 @@
+{
+  "name": "admin",
+  "version": "1.0.0",
+  "description": "Administration dashboard and plugin manager",
+  "entry_point": null
+}