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>

ui/nginx.conf

@@ -9,7 +9,7 @@ server {
         try_files $uri $uri/ /index.html;
     }
 
-    # API proxy — target set via CAMELEER_API_URL env var (default: http://cameleer3-server:8081)
+    # API proxy — target set via CAMELEER_API_URL env var (default: http://cameleer-server:8081)
     location /api/ {
         proxy_pass         ${CAMELEER_API_URL};
         client_max_body_size 200m;