feat: add role management and usage tracking modules

- Implemented role parsing and loading functionality in roles.js, allowing for structured role definitions with metadata.
- Added tests for role management to ensure correct parsing and loading of roles.
- Created usage.js to track API usage metrics, including token counts and rate limits.
- Developed tests for usage tracking to validate functionality and edge cases.
- Enhanced overall code structure and documentation for clarity and maintainability.

Dockerfile

@@ -1,10 +1,12 @@
 FROM alpine:latest
 
 # 安裝必要的工具
-RUN apk add --no-cache --no-check-certificate bash
-    
-COPY entrypoint.sh /entrypoint.sh
+RUN apk add --no-cache --no-check-certificate bash nodejs npm
 
+COPY ./app /app
+RUN cd /app && npm install
+
+COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 
 ENTRYPOINT ["/entrypoint.sh"]