Final-pass polish: support contact UX, audit tooltip, doc refresh

Support teams: contact management moved from a row expander to a modal
(Contacts (N) button per team); application detail Support card and the
modal show Email (mailto) and Teams chat buttons for contacts with an
SSO, derived as sso@ + a new contact_email_domain site setting
(default geaerospace.com, blank hides the buttons).

Audit log: hovering a user SSO shows the full name, resolved
best-effort from the employee directory in either mode.

Docs/hygiene from a standards review: CLAUDE.md active-state,
CONTRACT-STABILITY.md and README brought to contract 0.10.0 / 11
plugins / migration head 7d22; get_asset_panels endpoint path fixed in
the hook docstring; leftover debug console.logs removed.

781 tests pass; contacts modal, action-button hrefs, and the audit
tooltip verified live.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

shopdb/core/api/settings.py

@@ -434,6 +434,13 @@ def build_default_settings():
             'category': 'site',
             'description': 'Template for a printer hostname built from its IP. {ip} is the dash-separated IP address.'
         },
+        {
+            'key': 'contact_email_domain',
+            'value': 'geaerospace.com',
+            'valuetype': 'string',
+            'category': 'site',
+            'description': 'Email domain appended to a contact SSO to build email/Teams links (sso@domain). Blank disables contact action buttons.'
+        },
     ]
 
     # Site branding. Each instance (ADR-004) can replace the shipped GE defaults