chore: rename cameleer3 to cameleer

Rename Java packages from com.cameleer3 to com.cameleer, module
directories from cameleer3-* to cameleer-*, and all references
throughout workflows, Dockerfiles, docs, migrations, and pom.xml.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/Dockerfile

@@ -26,7 +26,7 @@ COPY docker-entrypoint.sh /cameleer-entrypoint.sh
 RUN chmod +x /cameleer-entrypoint.sh
 
 # Default API URL — override via K8s env or docker run -e
-ENV CAMELEER_API_URL=http://cameleer3-server:8081
+ENV CAMELEER_API_URL=http://cameleer-server:8081
 # Base path for serving the SPA from a subpath (e.g., /server/). Default: /
 ENV BASE_PATH=/