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.

templates/deck-framework.html

@@ -15,7 +15,7 @@
          transform: translate(-50%, -50%) scale(--deck-scale);
        JS only updates the CSS variable. No grid, no flex
        centering, no transform-origin tricks. This works inside
-       the OCD viewer's nested transform wrapper at any zoom.
+       the OD viewer's nested transform wrapper at any zoom.
        =========================================================== */
     :root {
       /* SLOT: theme tokens — the only top-level CSS the agent edits.
@@ -196,7 +196,7 @@
       // ---- scale-to-fit ---------------------------------------------------
       // Update one CSS variable; the stage uses
       //   transform: translate(-50%, -50%) scale(var(--deck-scale))
-      // which is bulletproof inside the OCD viewer's nested transform
+      // which is bulletproof inside the OD viewer's nested transform
       // wrapper. No element transforms set in JS — keeps the math local
       // to CSS and avoids order-of-operations bugs.
       function fit() {
@@ -231,7 +231,7 @@
         else if (e.key === 'Home') { e.preventDefault(); go(0); }
         else if (e.key === 'End') { e.preventDefault(); go(slides.length - 1); }
       }
-      // Capture phase + listen on both targets — inside the OCD iframe,
+      // Capture phase + listen on both targets — inside the OD iframe,
       // focus may be on window OR document; a single non-capture listener
       // silently misses presses.
       window.addEventListener('keydown', onKey, true);