Reposition site for KAM / Technical Sales / PM roles

Content rewrite based on latest resumes, shifting positioning from
Electrical Engineer to Key Account Manager · Technical Sales · Project Manager:

- Hero: new badge/subtitle; stats now 15+ yrs / 3.8M customer portfolio / 1,500+ projects
- About: BD-focused summary (GM/Foxconn/LG/Wanhua/Haiyang clients, C$1M+ programs),
  new highlight bullets (key accounts, technical sales, program management)
- Timeline: all five roles reframed with customer/commercial emphasis,
  added EV charging and Genghai No.1 offshore platform achievements
- Skills: re-categorized as Key Accounts & Sales / Project Management /
  Engineering Foundation / Tools & Digital
- Certs: added PMP (in progress); zh nav gains certs link
- Updated title, meta description, and OG tags on both EN and ZH pages

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: isparkyou-github