Add WebChat2API comprehensive requirements and integration analysis

- Created Tower/Requirements.md with complete functional specifications
- Created Tower/Integration-Analysis.md showing how Analyzer + Befly + OWL Browser fit together
- Documented AI-powered browser automation flow
- Defined OpenAI-compatible API structure
- Outlined error handling and self-healing mechanisms
- Analyzed integration patterns and best practices

Co-authored-by: Zeeeepa <zeeeepa@gmail.com>

Author: codegen-sh[bot]