feat(skills): E2E 验证通过 + 首个交付包(mp-00-visitor) + .design/tokens.yml

全管线验证结果:
- parse: 22 tokens, 5 screens, 7 components
- screenshots: 5/5 PNG 截图（2x 高清，裁掉设备框）
- token match: 20/22 matched (19 confirmed, 14 pending, 2 unmatched)
- interactions: 5/8 rules matched

交付包: docs/design/mp-00-visitor/
- screenshots/ (5 PNG)
- tokens.json (三层匹配结果)
- META.yml (元数据)

配置: .design/tokens.yml (项目级 Token 配置)

docs/design/mp-00-visitor/META.yml

@@ -0,0 +1,15 @@
+prototype: mp-00-visitor.html
+source: docs/design/mp-00-visitor.html
+generated_at: "2026-05-18T00:07:00+08:00"
+tokens:
+  matched: 20
+  unmatched: 2
+  confirmed: 19
+  pending: 14
+  approximate: 1
+components:
+  total: 7
+  mapped: 0
+  new: 0
+interactions: 5
+screens: 5