- Replace interfaces array with single interface_type string (web/terminal)
- Add requires_port boolean to indicate port/tunnel needs
- Create Alembic migration for database schema change
- Update backend model, API validation, and seed data
- Update frontend types and tool workshop UI with dropdown
- Add conditional port field rendering based on interface type
- Update all frontend and backend tests
OpenSpec change: enforce-single-tool-type-with-port-config
Quality gates: frontend typecheck PASS, lint PASS, tests 37/37 PASS
