feat: enhance Claude Code client detection with similarity matching

- Add string-similarity library for robust prompt comparison
- Extract Claude Code system prompts to separate contents module
- Implement similarity-based validation with configurable thresholds
- Support different validation logic for Haiku vs other Claude models
- Fix validation to properly handle array format system prompts

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -69,6 +69,7 @@
     "ora": "^5.4.1",
     "rate-limiter-flexible": "^5.0.5",
     "socks-proxy-agent": "^8.0.2",
+    "string-similarity": "^4.0.4",
     "table": "^6.8.1",
     "uuid": "^9.0.1",
     "winston": "^3.11.0",