feat(fusion_helpdesk_central): client-label field, views, branded ack email

x_fc_client_label on helpdesk.ticket (+ list/search exposure), create() override sends a branded acknowledgement (magic link via get_portal_url) for in-app-channel tickets only. 3 Enterprise tests (run on nexa).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_helpdesk_central/__manifest__.py

@@ -3,7 +3,7 @@
 # License OPL-1
 {
     'name': 'Fusion Helpdesk Central — Client API Keys',
-    'version': '19.0.1.0.2',
+    'version': '19.0.1.1.0',
     'category': 'Productivity',
     'summary': 'Admin UI on the central Odoo for issuing per-client API '
                'keys used by fusion_helpdesk client deployments.',
@@ -28,7 +28,9 @@ Depends only on `helpdesk`. No client-side install needed.
     'data': [
         'security/ir.model.access.csv',
         'data/ir_config_parameter_data.xml',
+        'data/mail_template_ack.xml',
         'views/fusion_helpdesk_client_key_views.xml',
+        'views/helpdesk_ticket_views.xml',
     ],
     'installable': True,
     'auto_install': False,