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>

.gitignore

@@ -22,7 +22,12 @@ Thumbs.db
 # Worktrees
 .worktrees/
 
+# Claude
+.claude/
+.superpowers/
+.playwright-mcp/
+.gitnexus
+
 # Generated by postinstall from @cameleer/design-system
 ui/public/favicon.svg
 docker/runtime-base/agent.jar
-.gitnexus