revert(plugins): Remove all plugin auto-registrations from core

Plugins should be installed via Plugin Store, not auto-registered in core.
Plugin registrations (INSTALLED_APPS and URL routes) are added dynamically
during plugin installation via pluginInstaller, not hardcoded in core.

Removed from INSTALLED_APPS:
- fail2ban
- discordAuth (already removed by user)
- googleTagManager
- discordWebhooks (already removed by user)

Removed from urls.py:
- All plugin URL routes (fail2ban, googleTagManager, discordAuth)

These plugins must be installed via Plugin Store, which will automatically
add them to INSTALLED_APPS and urls.py during installation.

CyberCP/settings.py

@@ -65,11 +65,8 @@ INSTALLED_APPS = [
 
     # Apps with multiple or complex dependencies
     'emailPremium',
-    'discordAuth',
-    'googleTagManager',
     'testPlugin',
     'premiumPlugin',
-    'fail2ban',
     'emailMarketing',   # Depends on websiteFunctions and loginSystem
     'cloudAPI',         # Depends on websiteFunctions
     'containerization', # Depends on websiteFunctions

CyberCP/urls.py

@@ -47,11 +47,8 @@ urlpatterns = [
     path('plugins/pm2Manager/',include('pm2Manager.urls')),
     path('plugins/paypalPremiumPlugin/', include('paypalPremiumPlugin.urls')),
     path('plugins/examplePlugin/', include('examplePlugin.urls')),
-    path('plugins/fail2ban/',include('fail2ban.urls')),
     path('plugins/premiumPlugin/',include('premiumPlugin.urls')),
     path('plugins/testPlugin/',include('testPlugin.urls')),
-    path('plugins/googleTagManager/',include('googleTagManager.urls')),
-    path('plugins/discordAuth/',include('discordAuth.urls')),
     path('plugins/', include('pluginHolder.urls')),
     path('emailMarketing/', include('emailMarketing.urls')),
     path('cloudAPI/', include('cloudAPI.urls')),