Merge pull request #3 from ZhangHanDong/review/ch01-improvements

chore: ignore Claude Code source bundle

docs: expand book with version evolution and observability

feat: add reverse engineering toolkit, specs, and project config

docs: fix part 7 figure numbering

docs: add skillify analysis and source

docs: publish chapter 24 and renumber part 7

docs: publish updated chapter 1

feat: publish updated book content and language switcher

feat: add english book scaffold

docs: publish part 7 and appendices

docs: expand preface background

chore: trigger pages deployment

docs: add book cover images

merge: preserve remote LICENSE