feat: Refactor service management scripts to use a unified dev script

- Added package.json to manage development scripts.
- Updated restart-services.ps1 to call the new dev script for starting services.
- Refactored start-admin.ps1, start-backend.ps1, start-frontend.ps1, and start-mcp.ps1 to utilize the dev script for starting respective services.
- Enhanced stop-services.ps1 to improve process termination logic by matching command patterns.

restart-services.ps1

@@ -15,10 +15,6 @@ $ErrorActionPreference = "Stop"
 $repoRoot = Split-Path -Parent $MyInvocation.MyCommand.Path
 $stopScript = Join-Path $repoRoot "stop-services.ps1"
 $devScript = Join-Path $repoRoot "dev.ps1"
-$frontendScript = Join-Path $repoRoot "start-frontend.ps1"
-$backendScript = Join-Path $repoRoot "start-backend.ps1"
-$adminScript = Join-Path $repoRoot "start-admin.ps1"
-$mcpScript = Join-Path $repoRoot "start-mcp.ps1"
 
 if (@($FrontendOnly, $BackendOnly, $AdminOnly, $McpOnly).Where({ $_ }).Count -gt 1) {
   throw "Use only one of -FrontendOnly, -BackendOnly, -AdminOnly, or -McpOnly."
@@ -45,46 +41,26 @@ else {
 Start-Sleep -Seconds 1
 
 if ($FrontendOnly) {
-  Start-Process powershell -ArgumentList @(
-    "-NoExit",
-    "-ExecutionPolicy", "Bypass",
-    "-File", $frontendScript
-  )
-  Write-Host "[restart] Frontend window restarted." -ForegroundColor Green
+  & $devScript -Only frontend -Spawn
+  Write-Host "[restart] Frontend tab restarted." -ForegroundColor Green
   exit 0
 }
 
 if ($BackendOnly) {
-  Start-Process powershell -ArgumentList @(
-    "-NoExit",
-    "-ExecutionPolicy", "Bypass",
-    "-File", $backendScript,
-    "-DatabaseUrl", $DatabaseUrl
-  )
-  Write-Host "[restart] Backend window restarted." -ForegroundColor Green
+  & $devScript -Only backend -Spawn -DatabaseUrl $DatabaseUrl
+  Write-Host "[restart] Backend tab restarted." -ForegroundColor Green
   exit 0
 }
 
 if ($AdminOnly) {
-  Start-Process powershell -ArgumentList @(
-    "-NoExit",
-    "-ExecutionPolicy", "Bypass",
-    "-File", $adminScript
-  )
-  Write-Host "[restart] Admin window restarted." -ForegroundColor Green
+  & $devScript -Only admin -Spawn
+  Write-Host "[restart] Admin tab restarted." -ForegroundColor Green
   exit 0
 }
 
 if ($McpOnly) {
-  Start-Process powershell -ArgumentList @(
-    "-NoExit",
-    "-ExecutionPolicy", "Bypass",
-    "-File", $mcpScript,
-    "-ApiKey", $McpApiKey,
-    "-BackendApiBase", $BackendApiBase,
-    "-Port", $McpPort
-  )
-  Write-Host "[restart] MCP window restarted." -ForegroundColor Green
+  & $devScript -Only mcp -Spawn -McpApiKey $McpApiKey -McpBackendApiBase $BackendApiBase -McpPort $McpPort
+  Write-Host "[restart] MCP tab restarted." -ForegroundColor Green
   exit 0
 }