1.1.0: .ruw project bundle + per-export target FPS

- New .ruw file format: a STORE-only zip wrapping project.json +
  an assets/ folder. packProject extracts every data-URL asset
  (images, audio, background video) into its own file and
  rewrites the in-JSON src fields to relative paths;
  unpackProject rehydrates back to data URLs on read. Zero
  dependencies — we ship a minimal in-house zip codec.
- ExportDialog surfaces the new format as a top-row
  "RUWIO project (.ruw)" option that round-trips through the
  welcome-dialog file picker. Legacy .json imports still work
  via byte-sniffing the PK header in readAnyProjectFile. Dead
  App.vue `exportProjectFile` helper removed.
- Frame-based exports (GIF, APNG, APNG preview) take an optional
  targetFps override so a 60fps project doesn't balloon the file
  — APNG / GIF size scales ~linearly with frame count. The
  ExportDialog grows a second input next to target size;
  defaults inherit the scene's fps and reset on each dialog
  open.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "ruwio",
   "private": true,
-  "version": "1.0.2",
+  "version": "1.1.0",
   "type": "module",
   "scripts": {
     "dev": "vite",