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-lock.json

@@ -30,6 +30,7 @@
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+        "string-similarity": "^4.0.4",
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         "uuid": "^9.0.1",
         "winston": "^3.11.0",
@@ -8425,6 +8426,13 @@
         "node": ">=10"
       }
     },
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+      "resolved": "https://registry.npmjs.org/string-similarity/-/string-similarity-4.0.4.tgz",
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+      "deprecated": "Package no longer supported. Contact Support at https://www.npmjs.com/support for more info.",
+      "license": "ISC"
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       "resolved": "https://registry.npmmirror.com/string-width/-/string-width-4.2.3.tgz",