chore: rename cameleer3 to cameleer

Rename Java packages from net.siegeln.cameleer3 to net.siegeln.cameleer,
update all references in workflows, Docker configs, docs, and bootstrap.

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

docker/runtime-base/Dockerfile

@@ -3,7 +3,7 @@ WORKDIR /app
 
 # Agent JAR and log appender JAR are copied during CI build from Gitea Maven registry
 COPY agent.jar /app/agent.jar
-COPY cameleer3-log-appender.jar /app/cameleer3-log-appender.jar
+COPY cameleer-log-appender.jar /app/cameleer-log-appender.jar
 
 ENTRYPOINT exec java \
   -Dcameleer.export.type=${CAMELEER_EXPORT_TYPE:-HTTP} \