Rebrand from Casera/MyCrib to honeyDue

Total rebrand across all Go API source files:
- Go module path: casera-api -> honeydue-api
- All imports updated (130+ files)
- Docker: containers, images, networks renamed
- Email templates: support email, noreply, icon URL
- Domains: casera.app/mycrib.treytartt.com -> honeyDue.treytartt.com
- Bundle IDs: com.tt.casera -> com.tt.honeyDue
- IAP product IDs updated
- Landing page, admin panel, config defaults
- Seeds, CI workflows, Makefile, docs
- Database table names preserved (no migration needed)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/i18n/translations/de.json

@@ -130,7 +130,7 @@
   "push.residence_shared.title": "Immobilie Geteilt",
   "push.residence_shared.body": "{{.UserName}} hat {{.ResidenceName}} mit Ihnen geteilt",
 
-  "email.welcome.subject": "Willkommen bei Casera!",
+  "email.welcome.subject": "Willkommen bei honeyDue!",
   "email.verification.subject": "Bestatigen Sie Ihre E-Mail",
   "email.password_reset.subject": "Passwort-Zurucksetzungscode",
   "email.tasks_report.subject": "Aufgabenbericht fur {{.ResidenceName}}",