fix: update Gitea org references from mosaic/ to mosaicstack/

- Update all package.json repo URLs (mosaic/mosaic-stack → mosaicstack/mosaic-stack)
- Update npm registry URLs (/api/packages/mosaic/npm → /api/packages/mosaicstack/npm)
- Update woodpecker publish destinations
- Update tools/install.sh registry and repo base URLs

packages/design-tokens/package.json

@@ -3,7 +3,7 @@
   "version": "0.0.2",
   "repository": {
     "type": "git",
-    "url": "https://git.mosaicstack.dev/mosaic/mosaic-stack.git",
+    "url": "https://git.mosaicstack.dev/mosaicstack/mosaic-stack.git",
     "directory": "packages/design-tokens"
   },
   "type": "module",
@@ -26,7 +26,7 @@
     "vitest": "^2.0.0"
   },
   "publishConfig": {
-    "registry": "https://git.mosaicstack.dev/api/packages/mosaic/npm/",
+    "registry": "https://git.mosaicstack.dev/api/packages/mosaicstack/npm/",
     "access": "public"
   },
   "files": [