build: generate desktop application release artifacts and update project configuration

apps/desktop/electron-builder.yml

@@ -0,0 +1,66 @@
+appId: com.eigen.desktop
+productName: EigenDesktop
+copyright: Copyright © 2026 Eigen
+
+directories:
+  buildResources: build
+  output: release
+
+# Include compiled electron-vite output + embedded web app build
+files:
+  - out/**/*
+  - web-dist/**/*
+
+# Copy web-dist into the app's resources folder at runtime
+extraResources:
+  - from: web-dist
+    to: web-dist
+    filter:
+      - "**/*"
+
+# --- Auto-Update Provider (GitHub Releases) ---
+# Switch to { provider: s3, bucket: ..., region: ... } for private S3
+publish:
+  provider: github
+  owner: YOUR_GITHUB_ORG
+  repo: YOUR_REPO_NAME
+
+# --- Windows ---
+win:
+  target:
+    - target: nsis
+      arch:
+        - x64
+        - arm64
+  icon: build/icon.ico
+
+nsis:
+  oneClick: false
+  allowToChangeInstallationDirectory: true
+  differentialPackage: true
+
+# --- macOS ---
+mac:
+  target:
+    - target: dmg
+      arch:
+        - x64
+        - arm64
+    - target: zip
+      arch:
+        - x64
+        - arm64
+  icon: build/icon.icns
+  hardenedRuntime: true
+  gatekeeperAssess: false
+  entitlements: build/entitlements.mac.plist
+  entitlementsInherit: build/entitlements.mac.plist
+
+# --- Linux ---
+linux:
+  target:
+    - target: AppImage
+      arch:
+        - x64
+  icon: build/icons
+  category: Office