docs(skills): design-handoff 设计稿 + spec + .gitignore 更新

- mp-11-doctor-core 设计交付包（截图 + tokens）
- mp-13/mp-14 新原型 HTML
- design-handoff skill 设计规格文档
- .gitignore 排除 dist-h5/test-results/uploads 等构建产物

.gitignore

@@ -28,6 +28,16 @@ docker/redis_data/
 
 # Test artifacts
 .test_token
+test-results/
+
+# Build outputs
+apps/miniprogram/dist-h5/
+
+# Runtime uploads
+uploads/
+
+# Temp logs
+_server_out.txt
 *.heapsnapshot
 perf-trace-*.json
 docs/debug-*.png