Fix Windows CUDA build: replace Compress-Archive and drop NSIS

- Replace Compress-Archive (2GB limit) with 7z for sidecar packaging
- Remove NSIS from bundle targets — NSIS has a 2GB per-file limit that
  breaks with CUDA-sized sidecar.zip; MSI (WiX) handles large files
  by splitting into multiple CABs
- Update Windows upload to look for .msi only

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

src-tauri/tauri.conf.json

@@ -31,7 +31,7 @@
   },
   "bundle": {
     "active": true,
-    "targets": ["deb", "nsis", "msi", "dmg"],
+    "targets": ["deb", "msi", "dmg"],
     "icon": [
       "icons/32x32.png",
       "icons/128x128.png",