Fix CUDA build scripts: Remove unsupported -y flag from uv pip uninstall

- uv pip uninstall doesn't support the -y flag (auto-confirm)
- uv uninstalls without confirmation by default
- Suppressed error output if torch not installed (2>/dev/null on Linux, 2>nul on Windows)
- Added || true on Linux to prevent script exit if torch not found

Fixes: error: unexpected argument '-y' found in CUDA build scripts

build-cuda.bat

@@ -13,7 +13,8 @@ if /i "%INSTALL_CUDA%"=="y" (
     echo Installing PyTorch with CUDA 12.1 support...
 
     REM Uninstall CPU-only version if present
-    uv pip uninstall -y torch
+    REM Note: uv doesn't support -y flag, it uninstalls without confirmation
+    uv pip uninstall torch 2>nul
 
     REM Install CUDA-enabled PyTorch
     REM This installs PyTorch with bundled CUDA runtime