Update sidecar build scripts for improved output handling

- Modified build commands in `package.json` for Windows, macOS, and Linux to ensure the output executable files are renamed appropriately after the build process.
- Enhanced the build process to streamline the deployment of the backend executables in the client application.

Author: Chen-speculation

client/package.json

@@ -14,9 +14,9 @@
     "tauri:dev": "tauri dev",
     "tauri:build": "tauri build",
     "build:sidecar": "node -e \"const p=process.platform;const m={win32:'winos',darwin:'macos',linux:'linux'};require('child_process').execSync('npm run build:sidecar-'+m[p],{stdio:'inherit'})\"",
-    "build:sidecar-winos": "cd ../backend && uv run pyinstaller -y --clean -n backend-x86_64-pc-windows-msvc --distpath ../client/src-tauri/bin/backend tauri_sidecar.spec",
-    "build:sidecar-macos": "cd ../backend && uv run pyinstaller -y --clean -n backend-aarch64-apple-darwin --distpath ../client/src-tauri/bin/backend tauri_sidecar.spec",
-    "build:sidecar-linux": "cd ../backend && uv run pyinstaller -y --clean -n backend-x86_64-unknown-linux-gnu --distpath ../client/src-tauri/bin/backend tauri_sidecar.spec"
+    "build:sidecar-winos": "cd ../backend && uv run pyinstaller -y --clean --distpath ../client/src-tauri/bin/backend tauri_sidecar.spec && move ..\\client\\src-tauri\\bin\\backend\\backend.exe ..\\client\\src-tauri\\bin\\backend\\backend-x86_64-pc-windows-msvc.exe",
+    "build:sidecar-macos": "cd ../backend && uv run pyinstaller -y --clean --distpath ../client/src-tauri/bin/backend tauri_sidecar.spec && mv ../client/src-tauri/bin/backend/backend ../client/src-tauri/bin/backend/backend-aarch64-apple-darwin",
+    "build:sidecar-linux": "cd ../backend && uv run pyinstaller -y --clean --distpath ../client/src-tauri/bin/backend tauri_sidecar.spec && mv ../client/src-tauri/bin/backend/backend ../client/src-tauri/bin/backend/backend-x86_64-unknown-linux-gnu"
   },
   "dependencies": {
     "@google/genai": "^1.29.0",
@@ -48,4 +48,4 @@
     "typescript": "~5.8.2",
     "vite": "^6.2.0"
   }
-}
+}