fix: downgrade noStaticOnlyClass lint rule from error to warning

- Configure noStaticOnlyClass as 'warn' instead of 'error' in biome.json
- Static-only classes are acceptable patterns for NestJS modules and factories
- Prevents lint errors from blocking the release process
- Maintains code quality while allowing architectural patterns

Author: kauandotnet

biome.json

@@ -23,7 +23,8 @@
       "complexity": {
         "noExtraBooleanCast": "error",
         "noUselessCatch": "error",
-        "noUselessTypeConstraint": "error"
+        "noUselessTypeConstraint": "error",
+        "noStaticOnlyClass": "warn"
       },
 
       "style": {