feat: enhance code quality and documentation

- Renamed Feedback class to follow PascalCase convention
- Fixed candidate enumeration start index from 0 to 1
- Simplified candidate content access by removing .message.content
- Updated CONFIG_PATH environment variable name to CONFIG_PATH_ARG
- Bumped version from 0.5 to 0.6
- Removed unnecessary return statement and trailing newline

router.py

@@ -2,7 +2,7 @@
 title: NOMYO Router - an Ollama Proxy with Endpoint:Model aware routing
 author: alpha-nerd-nomyo
 author_url: https://github.com/nomyo-ai
-version: 0.5
+version: 0.6
 license: AGPL
 """
 # -------------------------------------------------------------