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>

docs/superpowers/plans/2026-04-15-per-tenant-pg-isolation-plan.md

@@ -87,7 +87,7 @@ import java.sql.Statement;
 
 /**
  * Creates and drops per-tenant PostgreSQL users and schemas
- * on the shared cameleer3 database for DB-level tenant isolation.
+ * on the shared cameleer database for DB-level tenant isolation.
  */
 @Service
 public class TenantDatabaseService {