feat: integrate pino for structured logging and add logger utility

- Added pino and pino-pretty to package.json for logging.
- Created a logger utility in src/utils/logger.ts to handle logging configurations for production and development environments.
- Replaced console.log and console.error statements with logger methods in various service files (leetcode-cn-service.ts, leetcode-global-service.ts).
- Updated tests to use logger for logging messages instead of console.log.
- Improved error handling in services by removing try-catch blocks where appropriate and using promises directly.

Author: jinzcdev

package-lock.json

@@ -45,6 +45,7 @@
         "@modelcontextprotocol/sdk": "^1.8.0",
         "leetcode-query": "^2.0.0",
         "minimist": "^1.2.8",
+        "pino": "^9.6.0",
         "ts-node": "^10.9.2",
         "zod": "^3.24.2"
     },
@@ -64,7 +65,8 @@
         "tsc-watch": "6.2.1",
         "typescript": "^5.8.3",
         "typescript-eslint": "^8.29.1",
-        "vitest": "^3.1.1"
+        "vitest": "^3.1.1",
+        "pino-pretty": "^13.0.0"
     },
     "optionalDependencies": {
         "@rollup/rollup-linux-x64-gnu": "^4.40.0"