Update changes

install.ps1

@@ -0,0 +1,86 @@
+<#
+  SkillMate installer for Windows PowerShell.
+  Installs dependencies for backend, frontend, admin panel and creates a backend .env with dev defaults.
+#>
+
+param(
+  [switch]$SkipBuild
+)
+
+$ErrorActionPreference = 'Stop'
+
+function New-RandomHex([int]$length) {
+  if ($length % 2 -ne 0) { throw "Length must be even" }
+  $bytes = New-Object byte[] ($length / 2)
+  [System.Security.Cryptography.RandomNumberGenerator]::Fill($bytes)
+  return ($bytes | ForEach-Object { $_.ToString('x2') }) -join ''
+}
+
+$scriptRoot = Split-Path -Parent $MyInvocation.MyCommand.Path
+Write-Host "==> Installing SkillMate dependencies..." -ForegroundColor Cyan
+
+if (-not (Get-Command node -ErrorAction SilentlyContinue)) {
+  throw 'Node.js is required but was not found in PATH. Install Node.js LTS first.'
+}
+
+$npmVersion = (& npm --version)
+Write-Host "   npm version $npmVersion detected." -ForegroundColor DarkGray
+
+$projects = @('backend', 'frontend', 'admin-panel')
+foreach ($project in $projects) {
+  $projectPath = Join-Path $scriptRoot $project
+  if (-not (Test-Path $projectPath)) {
+    throw "Project folder '$project' not found."
+  }
+
+  Write-Host "--> Installing dependencies in $project..." -ForegroundColor Cyan
+  Push-Location $projectPath
+  try {
+    if (Test-Path 'package-lock.json') {
+      npm ci
+    } else {
+      npm install
+    }
+  } finally {
+    Pop-Location
+  }
+}
+
+$envPath = Join-Path $scriptRoot 'backend/.env'
+if (-not (Test-Path $envPath)) {
+  Write-Host '--> Creating backend/.env with development defaults...' -ForegroundColor Cyan
+  $fieldKey = New-RandomHex 64
+  $dbKey = New-RandomHex 64
+  @(
+    'NODE_ENV=development'
+    'PORT=3004'
+    "FIELD_ENCRYPTION_KEY=$fieldKey"
+    "DATABASE_ENCRYPTION_KEY=$dbKey"
+    'FRONTEND_URL=http://localhost:5173'
+    'ADMIN_PANEL_URL=http://localhost:5174'
+    'NODE_TYPE=admin'
+  ) | Set-Content -Path $envPath -Encoding utf8
+}
+
+if (-not $SkipBuild) {
+  Write-Host '==> Building frontend and admin panel...' -ForegroundColor Cyan
+  foreach ($project in @('frontend', 'admin-panel')) {
+    Push-Location (Join-Path $scriptRoot $project)
+    try {
+      npm run build
+    } finally {
+      Pop-Location
+    }
+  }
+  Write-Host '==> Building backend...' -ForegroundColor Cyan
+  Push-Location (Join-Path $scriptRoot 'backend')
+  try {
+    npm run build
+  } finally {
+    Pop-Location
+  }
+} else {
+  Write-Host '!! SkipBuild set: build steps skipped.' -ForegroundColor DarkYellow
+}
+
+Write-Host "Installation complete. Use run-dev.cmd or run-prod.cmd to start services." -ForegroundColor Green