refine post-install and hardware GPU docs, Monitor UX and CLI styling

- rewrite the 15 post-install pages and the 3 hardware GPU pages so they reflect the current scripts (reversibility, tracked-tool counts, kernel parameters, per-tool commands, Alpine LXC propagation flow)
- migrate the legacy step-badge helper on post-install/optional and create-vm/synology to the canonical pill component, with the stepLabel key added in each locale
- fix rich-text i18n calls missing helpers across network, automated, optional, security, customization and the post-install landing pages, and escape the `<iface>` placeholder in automated so intl no longer parses it as a tag
- remove the mouse-follow blue overlay from the docs landing layout
- reposition the App-tab Edit button and stack the Search and Register controls vertically on mobile
- move the Bulk update Configure/Edit control into the section header so it behaves the same on desktop and mobile
- show a spinner during the final autoremove/autoclean pass of update-pve-safe so the cleanup step reads as active instead of silent
- restyle the shell spinner and msg_info in a distinctive purple and drop the unused msg_lang duplicate
- add a web-docs i18n build script and its CI workflow, plus tests for the pushover notification channel

AppImage/scripts/notification_manager.py

@@ -3,7 +3,8 @@ ProxMenux Notification Manager
 Central orchestrator for the notification service.
 
 Connects:
-- notification_channels.py  (transport: Telegram, Gotify, Discord)
+- notification_channels.py  (transport: Telegram, Gotify, Discord, Email,
+                              Pushover, Apprise)
 - notification_templates.py (message formatting + optional AI)
 - notification_events.py    (event detection: Journal, Task, Polling watchers)
 - health_persistence.py     (DB: config storage, notification_history)
@@ -79,6 +80,8 @@ SENSITIVE_KEYS = {
     'gotify.token',
     'discord.webhook_url',
     'email.password',
+    'pushover.user_key',
+    'pushover.api_token',
     'apprise.url',
     'webhook_secret',
 }
@@ -2520,9 +2523,10 @@ class NotificationManager:
         channels_info = {}
         for ch_type, info in CHANNEL_TYPES.items():
             enabled = self._config.get(f'{ch_type}.enabled', 'false') == 'true'
+            required_keys = info.get('required_keys', info['config_keys'])
             configured = all(
                 bool(self._config.get(f'{ch_type}.{k}', ''))
-                for k in info['config_keys']
+                for k in required_keys
             )
             channels_info[ch_type] = {
                 'name': info['name'],