fix: update requirements.txt with missing dependencies and fix installation errors

[devsanthoshmk]

Summary of Changes

This PR resolves installation errors and missing runtime dependencies in requirements.txt:

1. Remove obsolete package json-lib==0.5.1:

   • json-lib is an unmaintained C extension that fails to build/install on modern Python versions (e.g. 3.10+). Python's standard library json is used instead.

2. Add missing dependencies used in main.py pipeline:

   • pandas>=2.0.0: Required by pipeline/orchestrator.py for pipeline dataframe operations.
   • beautifulsoup4>=4.12.0: Required by enrichment/web_scraper.py for lead website parsing.

3. Add brotli>=1.1.0:

   • mapScraper/placesCrawlerV2.py sends Accept-Encoding: gzip, deflate, br. Without brotli, aiohttp raises 400 Can not decode content-encoding: brotli (br).

4. Clean up standard library and redundant packages:

   • Removed argparse==1.4.0 and asyncio as they are built into standard library Python.
   • Relaxed overly rigid version pins to support modern Python (3.10 through 3.14).

---

Verification

• Tested clean installation in a fresh Python virtual environment