feat: initial SA Tender Monitor project

- OCDS API client for eTenders.gov.za (primary tender discovery)
- Web UI scraper using Playwright (fetches supportDocument[] array
  that the OCDS API doesn't expose — only 1 doc per tender in OCDS)
- SQLite database with full schema for tenders + documents
- Click CLI: pull, stats, list, show commands
- 10 unit tests (all passing) covering models, OCDS parsing,
  web UI parsing, and document enrichment logic
- Comprehensive research report: 75+ SA tender sources documented
  with automation details (API/RSS/scraping availability per source)
- Hybrid architecture: OCDS for discovery + web scraping for full
  document lists (verified: web UI shows 2+ docs, OCDS shows 1)

requirements.txt

@@ -0,0 +1,10 @@
+httpx>=0.28.1,<1
+beautifulsoup4>=4.12.3,<5
+lxml>=5.3.0,<6
+selectolax>=0.3.27,<1
+playwright>=1.49.0,<2
+rich>=13.9.0,<14
+click>=8.1.7,<9
+feedparser>=6.0.11,<7
+python-dateutil>=2.9.0,<3
+tqdm>=4.67.0,<5