Align card set with github-profile-summary-cards' 5-card layout:
0-profile-details.svg (unchanged)
1-repos-per-language.svg (new) owned repos grouped by primary language
2-most-commit-language.svg (new) last-year commits attributed to each repo's primary language
3-stats.svg (renumbered)
4-productive-time.svg (renumbered)
- FetchProductive now fills p.CommitsByLanguage from the same commit history
it uses for the heatmap, so no extra API calls are introduced.
- TopRepos carries primary language so productive-time can aggregate by lang.
- LangStat.Bytes renamed to Value (repo count or commit count, context-dependent).
- Shared bar+legend renderer extracted to language_bar.go.
- Ignore generated output/ directory.
tiennm99