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/init-job.yaml

@@ -14,7 +14,7 @@ spec:
             - |
               PGPASSWORD=$POSTGRES_PASSWORD psql \
                 -h cameleer-postgres.cameleer.svc.cluster.local \
-                -U $POSTGRES_USER -d cameleer3 \
+                -U $POSTGRES_USER -d cameleer \
                 -c "CREATE SCHEMA IF NOT EXISTS BRANCH_SCHEMA"
           env:
             - name: POSTGRES_USER