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/flask_proxmenux_routes.py

@@ -29,6 +29,9 @@ TOOL_METADATA = {
     'kernel_panic':         {'name': 'Kernel Panic Configuration',            'function': 'configure_kernel_panic',       'version': '1.0'},
     'apt_ipv4':             {'name': 'APT IPv4 Force',                        'function': 'force_apt_ipv4',               'version': '1.0'},
     'kexec':                {'name': 'kexec for quick reboots',               'function': 'enable_kexec',                 'version': '1.0'},
+    'rpc':                  {'name': 'RPC / rpcbind Disable',                  'function': 'disable_rpc',                  'version': '1.0'},
+    'motd':                 {'name': 'Custom MOTD Banner',                     'function': 'setup_motd',                   'version': '1.0'},
+    'system_utils':         {'name': 'System Utilities',                       'function': 'install_system_utils',         'version': '1.0'},
     'network_optimization': {'name': 'Network Optimizations',                 'function': 'apply_network_optimizations',  'version': '1.0'},
     'bashrc_custom':        {'name': 'Bashrc Customization',                  'function': 'customize_bashrc',             'version': '1.0'},
     'figurine':             {'name': 'Figurine',                              'function': 'configure_figurine',           'version': '1.0'},