feat(ui): modern UI redesign with 4 tabs, glassmorphism cards, and pure HTML nutrition dashboard

chore: 从仓库移除所有已追踪的 __pycache__/*.pyc 文件（共43个），.gitignore 规则现已完整生效

refactor: remove voice tab, merge chat to home, fix recent records HTML table, clean emoji

refactor: simplify homepage + clean emoji from reports + fix fonts

feat: add i18n (zh/en) language switcher + fix matplotlib Chinese font rendering

chore: save current version before UI improvements (i18n + font fix)

CLine 界面初版