Expand pyright include to modules and infrastructure #38

Summary

CI typecheck is advisory and [tool.pyright] include is limited to src/voxforge/api and src/voxforge/core. Modules and infrastructure are the bulk of production code.

Context

• pyproject.toml [tool.pyright]
• .github/workflows/ci.yml “Typecheck (advisory)”
• make typecheck if present

Acceptance criteria

• include covers src/voxforge/modules and src/voxforge/infrastructure
• Highest-signal errors fixed so make typecheck is usable
• Keep CI advisory until clean; do not flip blocking in the same PR unless the run is zero-error
• No regressions in api/core