Update product-forge to v1.5.1 in community catalog (#2352)

* Update product-forge to v1.5.0 in community catalog

- Extension ID: product-forge
- Version: 1.1.1 → 1.5.0
- Author: VaiYav
- Description: updated to reflect v1.5 features (portfolio, lite mode,
  monorepo, optional V-Model)
- Commands: 10 → 29
- Tags: refreshed to reflect current surface area
- download_url pinned to v1.5.0 release tag
- updated_at bumped to 2026-04-24

Release: https://github.com/VaiYav/speckit-product-forge/releases/tag/v1.5.0

* Bump product-forge to v1.5.1 (docs patch)

Follow-up to v1.5.0 that surfaces the optional V-Model dependency
(leocamello/spec-kit-v-model ≥ 0.5.0) in README Requirements,
config-template.yml, and docs/config.md. Docs-only patch — no
behavioural change.

Release: https://github.com/VaiYav/speckit-product-forge/releases/tag/v1.5.1