feat(compliance): add GDPR, HIPAA, SOC2 compliance templates with one-click apply and dashboard

- Add ComplianceTemplate model in app/models.py
- Create database migration 027_add_compliance_templates
- Add compliance_enabled feature flag to config and settings metadata
- Create compliance_service.py with pre-built template definitions and evaluation
- Create compliance API endpoints (list, get, apply, status, summary)
- Create compliance admin view and dashboard template
- Add compliance link to admin navigation (desktop and mobile)
- Seed compliance templates at application startup
- Add comprehensive tests (29 passing)

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

app/utils/settings_service.py

@@ -1595,6 +1595,18 @@ SETTING_METADATA = {
         "required": False,
         "restart_required": False,
     },
+    "compliance_enabled": {
+        "category": "Feature Flags",
+        "description": (
+            "Enable the compliance templates dashboard (GDPR, HIPAA, SOC 2). "
+            "When enabled, admins can view compliance status and apply "
+            "pre-built regulatory configurations. Default: True."
+        ),
+        "type": "boolean",
+        "sensitive": False,
+        "required": False,
+        "restart_required": False,
+    },
     # Backup / Restore
     "backup_enabled": {
         "category": "Backup",