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/tweaks/SKILL.md

@@ -18,7 +18,7 @@ triggers:
   - "可调参数面板"
   - "side panel"
   - "knobs"
-ocd:
+od:
   mode: prototype
   platform: desktop
   scenario: design

skills/tweaks/example.html

@@ -579,7 +579,7 @@ $ filebase sync --watch
     <footer class="ft">
       <span>© 2026 Filebase, Inc.</span>
       <span>Privacy · Terms · Status</span>
-      <span>built with the OCD tweaks skill</span>
+      <span>built with the OD tweaks skill</span>
     </footer>
   </div>