rename project from SixFlagsSuperCalendar to Thoosie Calendar

Update package names, Docker image tags, CI/CD workflow, and
documentation to reflect the public brand name. References to
the actual Six Flags theme park chain/API are intentionally kept.

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

.gitea/workflows/deploy.yml

@@ -25,7 +25,7 @@ jobs:
           context: .
           target: web
           push: true
-          tags: ${{ vars.REGISTRY }}/${{ gitea.repository_owner }}/sixflagssupercalendar:web
+          tags: ${{ vars.REGISTRY }}/${{ gitea.repository_owner }}/thoosiecalendar:web
 
       - name: Build and push backend image
         uses: docker/build-push-action@v6
@@ -33,4 +33,4 @@ jobs:
           context: .
           target: backend
           push: true
-          tags: ${{ vars.REGISTRY }}/${{ gitea.repository_owner }}/sixflagssupercalendar:backend
+          tags: ${{ vars.REGISTRY }}/${{ gitea.repository_owner }}/thoosiecalendar:backend