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.

package.json

@@ -1,12 +1,12 @@
 {
-  "name": "open-claude-design",
+  "name": "open-design",
   "version": "0.1.0",
   "private": true,
   "type": "module",
   "description": "Local-first design product: detects your installed code-agent CLI, runs design skills + design systems, streams artifacts into a sandboxed preview.",
   "license": "Apache-2.0",
   "bin": {
-    "ocd": "./daemon/cli.js"
+    "od": "./daemon/cli.js"
   },
   "scripts": {
     "daemon": "node daemon/cli.js --no-open",