feat: update configuration for OpenAI and Anthropic endpoints

- Created a new .env.example file with default environment variables for PORT, OPENAI_UPSTREAM_URL, ANTHROPIC_UPSTREAM_URL, and DATABASE_URL.
- Updated .npmignore to exclude all .env files except .env.example.
- Revised CONTRIBUTING.md to simplify the contribution process and provide clearer setup instructions.
- Enhanced cost.ts with detailed type definitions and improved cost calculation logic.
- Updated proxy.ts to include new environment variables and improved logging functionality.
- Modified README.md to reflect new configuration instructions and usage examples.
- Removed unnecessary dashboard files and streamlined the project structure.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "openproxy",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "A lightweight, production-ready OpenAI-compatible proxy server that seamlessly forwards LLM API requests to any endpoint with comprehensive logging, cost tracking, and PostgreSQL integration. Perfect for monitoring API usage, calculating costs, and maintaining audit trails for your AI applications.",
   "main": "proxy.ts",
   "scripts": {
@@ -41,5 +41,6 @@
     "dotenv": "^17.2.3",
     "pg": "^8.16.3",
     "uuid": "^13.0.0"
-  }
+  },
+  "packageManager": "pnpm@10.26.1+sha512.664074abc367d2c9324fdc18037097ce0a8f126034160f709928e9e9f95d98714347044e5c3164d65bd5da6c59c6be362b107546292a8eecb7999196e5ce58fa"
 }