Server build & embed helpers

Short instructions to build and embed the SPA into the Go server binary.

• Build for host (mac/linux):

make build-embed

• Build Windows executable (cross-compile) from mac/linux (requires Go installed):

# run PowerShell script (requires pwsh)
make windows

# or do it manually from the repository root:
cd server
cp -R ../app/dist/spa/. server/static/
GOOS=windows GOARCH=amd64 go build -o server/server_windows.exe main.go

After building, run the binary (host OS):

PORT=8080 ./server/server.bin

• Build mac binaries (darwin amd64 + arm64):

make mac
# or manually:
cd server
GOOS=darwin GOARCH=amd64 go build -o server/server_darwin_amd64 main.go
GOOS=darwin GOARCH=arm64 go build -o server/server_darwin_arm64 main.go