fix(fusion_helpdesk): render message bodies as HTML, not escaped text

The OWL dialog used <t t-out="m.body"/> on message bodies, but t-out
escapes plain strings — it only renders raw when the value is a Markup
instance. Bodies arrive over JSON-RPC as plain strings (Markup is a
client-side type, doesn't cross the wire), so the customer was seeing
literal "<p>This has been fixed.</p>" in the thread instead of the
rendered HTML.

Wrap incoming bodies in `markup()` at the boundary (openTicket +
sendReply call sites) so the template renders them as the sanitised
HTML the central chatter already produced. Trust is fine — the body is
sanitised server-side by mail.thread before it ever leaves nexa.

Bumps fusion_helpdesk to 19.0.1.7.1.

fusion_helpdesk/__manifest__.py

@@ -3,7 +3,7 @@
 # License OPL-1 (Odoo Proprietary License v1.0)
 {
     'name': 'Fusion Helpdesk Reporter',
-    'version': '19.0.1.7.0',
+    'version': '19.0.1.7.1',
     'category': 'Productivity',
     'summary': 'One-click in-app bug reporting & feature requesting — '
                'auto-creates a helpdesk.ticket on a central Odoo Helpdesk.',