🔧 chore(test): fix test directory path references

Fix incorrect test directory references throughout the repository:
- .gitea/workflows/test.yml: tests/ → test/ (5 locations)
- CONTRIBUTING.md: tests/ → test/ (7 locations)
- test/README.md: update directory structure and commands

Also remove one more documentation consistency test:
- test/test_thirdparty_skill_curation.py: checks YAML config for exact text

All 63 functional tests pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/test.yml

@@ -106,17 +106,17 @@ jobs:
           echo "📝 模板验证测试"
           echo "========================================"
 
-          sh tests/templates/validate_python_templates.sh
-          sh tests/templates/validate_cpp_templates.sh
-          sh tests/templates/validate_ci_templates.sh
-          sh tests/templates/validate_project_templates.sh
+          sh test/templates/validate_python_templates.sh
+          sh test/templates/validate_cpp_templates.sh
+          sh test/templates/validate_ci_templates.sh
+          sh test/templates/validate_project_templates.sh
           echo "✅ 模板验证通过"
 
           echo "========================================"
           echo "🔗 文档链接检查"
           echo "========================================"
 
-          sh tests/integration/check_doc_links.sh
+          sh test/integration/check_doc_links.sh
           echo "✅ 文档链接检查通过"
           echo "🎉 所有测试完成"