feat: Windows NSIS installer, embedded icons, GUI auto-launch backend

- Add package/installer.nsi (Full/Server/Client) and toolchain.nsi
- Embed icon.ico (rounded corners) into homed.exe/waiter.exe via .syso
- GUI auto-launches homed.exe from parent dir (Windows only)
- GUI fallback connections.json from app resource dir
- Add initconfig command for config.db seeding
- Replace waiter rawmode* with raw_{unix,windows,other}.go
- Fix .gitignore: /homed instead of homed, add login.json
- Update icon.svg with rounded rect, new mascot.svg

cmd/waiter/raw_windows.go

@@ -0,0 +1,52 @@
+//go:build windows
+
+package main
+
+import (
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+var (
+	kernel32                       = syscall.NewLazyDLL("kernel32.dll")
+	procGetConsoleMode             = kernel32.NewProc("GetConsoleMode")
+	procSetConsoleMode             = kernel32.NewProc("SetConsoleMode")
+	procGetStdHandle               = kernel32.NewProc("GetStdHandle")
+)
+
+const (
+	stdInputHandle  = ^uint32(9) + 1 // -10
+	enableVirtualTerminalProcessing = 0x0004
+	enableProcessedOutput           = 0x0001
+	enableWrapAtEOLOutput           = 0x0002
+	disableNewlineAutoReturn        = 0x0008
+)
+
+func setRawMode(fd int) (func(), error) {
+	if fd == 0 {
+		fd = int(os.Stdin.Fd())
+	}
+	if !isTerminal(fd) {
+		return func() {}, nil
+	}
+	// Enable virtual terminal processing for ANSI escape sequences on Windows
+	h, _, _ := procGetStdHandle.Call(uintptr(^uint32(10) + 1)) // STD_OUTPUT_HANDLE = -11
+	if h != 0 && h != ^uintptr(0) {
+		var mode uint32
+		procGetConsoleMode.Call(h, uintptr(unsafe.Pointer(&mode)))
+		newMode := mode | enableVirtualTerminalProcessing | enableProcessedOutput | enableWrapAtEOLOutput
+		procSetConsoleMode.Call(h, uintptr(newMode))
+	}
+	return func() {}, nil
+}
+
+func isTerminal(fd int) bool {
+	var mode uint32
+	h, _, _ := procGetStdHandle.Call(uintptr(^uint32(10) + 1)) // STD_OUTPUT_HANDLE = -11
+	if h == 0 || h == ^uintptr(0) {
+		return false
+	}
+	ret, _, _ := procGetConsoleMode.Call(h, uintptr(unsafe.Pointer(&mode)))
+	return ret != 0
+}