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>

docker-compose.yml

@@ -4,7 +4,7 @@ services:
     ports:
       - "5432:5432"
     environment:
-      POSTGRES_DB: cameleer3
+      POSTGRES_DB: cameleer
       POSTGRES_USER: cameleer
       POSTGRES_PASSWORD: cameleer_dev
     volumes: