Build JS on CI host, copy dist into Docker image for faster arm64 builds; v1.0.5

Removes the build stage from Dockerfile so npm install/build no longer run under
QEMU emulation — only the lightweight runtime stage runs per-platform, making
arm64 images build reliably.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "1.0.4",
+  "version": "1.0.5",
   "type": "module",
   "scripts": {
     "dev": "vite",