Remove unused boilerplate and stale data files; bump to v1.0.3

Deletes src/data/projects.ts (never imported), and the three unused
Vite boilerplate assets (react.svg, vite.svg, hero.png).

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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "1.0.2",
+  "version": "1.0.3",
   "type": "module",
   "scripts": {
     "dev": "vite",