feat: add dynamic creator API endpoints for schema-driven scaffolding

[cidrblock]

Summary

• Adds three new endpoints to the ADT server that leverage ansible-creator's V1 programmatic API for dynamic, schema-driven scaffolding:
  • GET /v2/creator/capabilities -- discover all available ansible-creator commands
  • GET /v2/creator/schema?command_path=init&command_path=collection -- retrieve parameter schema for a specific command
  • POST /v2/creator/scaffold -- scaffold any project type dynamically via {"command_path": [...], "params": {...}}
• This eliminates the need to modify ADT every time ansible-creator adds a new scaffolding capability
• Includes OpenAPI schema definitions, handler implementation, and 13 integration tests

Depends on

• feat: add dynamic V1 programmatic API and schema subcommand ansible-creator#525 (V1 programmatic API)

Test plan

• All 13 new integration tests pass (test_server_creator_dynamic.py)
• Pre-commit hooks pass (ruff, mypy, pylint, cspell, pydoclint)
• CI passes
• Existing tests unaffected