Refactor project name from "Open Claude Design" to "Open Design" (#1)

* Refactor project name from "Open Claude Design" to "Open Design"

- Updated project name in package.json, package-lock.json, and README files.
- Changed CLI commands and references from "ocd" to "od".
- Adjusted file structure references in documentation and code to reflect new naming conventions.
- Enhanced .gitignore to include new runtime data files.
- Updated metadata in LICENSE file to match new project name.

* Add contributing guidelines in English and Chinese

- Introduced CONTRIBUTING.md and CONTRIBUTING.zh-CN.md to provide clear instructions for contributors.
- Outlined contribution types, local setup instructions, and merging criteria for skills and design systems.
- Enhanced README files to reference the new contributing guidelines.

skills/critique/example.html

@@ -389,7 +389,7 @@
           <span>·</span>
           <span>2026.04.27</span>
           <span>·</span>
-          <span>OCD · Critique skill</span>
+          <span>OD · Critique skill</span>
         </div>
         <h1 class="hd-title">magazine-web-ppt<br>example deck</h1>
       </div>
@@ -662,7 +662,7 @@
     </div>
 
     <footer class="ft">
-      <span>OCD · Critique skill · v0.1</span>
+      <span>OD · Critique skill · v0.1</span>
       <span>5 dimensions · Phil / Hier / Det / Func / Innov</span>
       <span class="br">github.com/alchaincyf/huashu-design</span>
     </footer>