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>

deploy/overlays/feature/ingress.yaml

@@ -11,6 +11,6 @@ spec:
             pathType: Prefix
             backend:
               service:
-                name: cameleer3-ui
+                name: cameleer-ui
                 port:
                   number: 80