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/SKILL.md

@@ -19,7 +19,7 @@ triggers:
   - "review my landing page"
   - "评审"
   - "复盘"
-ocd:
+od:
   mode: prototype
   platform: desktop
   scenario: design
@@ -52,7 +52,7 @@ the *huashu-design* expert-critique flow.
 A single self-contained `<artifact type="text/html">` review report
 including:
 
-1. **Header** — what artifact was reviewed, date, reviewer ("OCD ·
+1. **Header** — what artifact was reviewed, date, reviewer ("OD ·
    Critique skill"), 1-line verdict
 2. **Radar chart** (inline SVG, no library) showing the 5 scores
 3. **Five dimension cards**, each with: