build: add spacetime local dev scripts

server-rs/scripts/spacetime-dev.ps1

@@ -0,0 +1,67 @@
+[CmdletBinding()]
+param(
+    [Alias("h")]
+    [switch]$Help,
+    [string]$ListenHost = "127.0.0.1",
+    [int]$Port = 3001,
+    [string]$RootDir = ""
+)
+
+$ErrorActionPreference = "Stop"
+
+function Write-Usage {
+    @(
+        'Usage:'
+        '  ./server-rs/scripts/spacetime-dev.ps1'
+        '  ./server-rs/scripts/spacetime-dev.ps1 -ListenHost 127.0.0.1 -Port 3101'
+        ''
+        'Notes:'
+        '  1. Start local standalone SpacetimeDB for the Genarrative Rust backend'
+        '  2. Store local SpacetimeDB state in server-rs/.spacetimedb/local by default'
+        '  3. Current stage only boots the standalone server and does not publish a module yet'
+    ) -join [Environment]::NewLine
+}
+
+if ($Help) {
+    Write-Usage
+    exit 0
+}
+
+$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+$serverRsDir = Split-Path -Parent $scriptDir
+
+if ([string]::IsNullOrWhiteSpace($RootDir)) {
+    $RootDir = Join-Path $serverRsDir ".spacetimedb\local"
+}
+
+if (-not (Test-Path (Join-Path $serverRsDir "apps\spacetime-module\README.md"))) {
+    throw "Missing server-rs/apps/spacetime-module/README.md, cannot start SpacetimeDB local dev script."
+}
+
+$spacetimeCommand = Get-Command spacetime -ErrorAction SilentlyContinue
+
+if ($null -eq $spacetimeCommand) {
+    throw @(
+        "Missing 'spacetime' CLI.",
+        "Install guide: https://spacetimedb.com/install",
+        "Windows PowerShell: iwr https://windows.spacetimedb.com -useb | iex"
+    ) -join " "
+}
+
+New-Item -ItemType Directory -Force -Path $RootDir | Out-Null
+
+$listenAddress = "$ListenHost`:$Port"
+
+Write-Host "[server-rs:spacetime-dev] working dir: $serverRsDir"
+Write-Host "[server-rs:spacetime-dev] root dir: $RootDir"
+Write-Host "[server-rs:spacetime-dev] listen addr: $listenAddress"
+Write-Host "[server-rs:spacetime-dev] mode: standalone"
+Write-Host "[server-rs:spacetime-dev] note: module publish is deferred until apps/spacetime-module scaffold lands"
+
+Push-Location $serverRsDir
+try {
+    & $spacetimeCommand.Source --root-dir $RootDir start --edition standalone --listen-addr $listenAddress
+}
+finally {
+    Pop-Location
+}