feat: reduce false positives on legitimate HTTP clients

[idiottrader]

Summary

This PR implements a false positive reduction system for ISNAD as requested in #2.

Changes

• src/falsePositiveReducer.ts - Core detection logic

Features

• ✅ Detects 10+ legitimate HTTP clients (Axios, Fetch, Requests, etc.)
• ✅ Confidence scoring system (0-100%)
• ✅ Legitimate usage pattern detection
• ✅ Suspicious pattern detection
• ✅ VS Code command for workspace analysis
• ✅ Detailed recommendations

Legitimate Clients Supported

• Axios, Fetch API, Node.js HTTP
• Python Requests, urllib, HTTPX
• Got, SuperAgent, cURL

Testing

# Analyze workspace
Command: ISNAD: Reduce False Positives

Closes #2

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