Documentation fixes:
- Rewrote ADAPTER-SPECIFICATIONS.md with correct modular structure
- Added 10 missing database tables to TABLES.md
- Rewrote EVENTS.md with accurate 29 events
- Fixed CONSTANTS.md with correct QZPAY_ prefix
- Fixed all package READMEs with correct API usage
- Fixed all examples with correct imports and parameters
- Fixed main README with correct API usage