Update quickstart scripts to always rebuild containers

- Added --build flag to docker-compose up command
- Ensures latest code changes are always included
- Prevents issues with stale cached images
- Updated all three quickstart scripts (Linux/macOS, Windows batch, PowerShell)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

quickstart.ps1

@@ -46,13 +46,13 @@ if (-Not (Test-Path ".env")) {
 }
 
 Write-Host ""
-Write-Host "Starting services with Docker Compose..." -ForegroundColor Yellow
+Write-Host "Building and starting services with Docker Compose..." -ForegroundColor Yellow
 
-# Start services
+# Start services with rebuild
 if ($composeCmd -eq "docker-compose") {
-    docker-compose up -d
+    docker-compose up -d --build
 } else {
-    docker compose up -d
+    docker compose up -d --build
 }
 
 if ($LASTEXITCODE -ne 0) {