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>

.github/workflows/backend-ci.yml

@@ -60,10 +60,10 @@ jobs:
           cache: true
 
       - name: Build API
-        run: go build -ldflags "-s -w" -o bin/casera-api ./cmd/api
+        run: go build -ldflags "-s -w" -o bin/honeydue-api ./cmd/api
 
       - name: Build Worker
-        run: go build -ldflags "-s -w" -o bin/casera-worker ./cmd/worker
+        run: go build -ldflags "-s -w" -o bin/honeydue-worker ./cmd/worker
 
   lint:
     name: Lint