[myai] feat(codegen): inject bojemoi SDK context via vuln_type param

Commit `a05967a`

codegen.py: add vuln_type param to generate_code(), inject bojemoi context prefix from vuln_context.get_context() when SDK is available
main.py: add Optional[str] vuln_type field to GenerateRequest, pass it through to generate_code()
requirements.txt: add bojemoi-sdk from gitea as git dep

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com