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>

examples/DESIGN-SYSTEM.md

@@ -1,4 +1,4 @@
-# Cameleer3 Design System
+# Cameleer Design System
 
 ## Concept