fix: improve llmwiki search integration

scripts/start-backend.ps1

@@ -0,0 +1,42 @@
+. "$PSScriptRoot\env.ps1"
+
+$PidFile = Join-Path $PidDir "backend.pid"
+$LogFile = Join-Path $LogDir "backend.log"
+
+if (Test-PidRunning $PidFile) {
+    $existingPid = Get-Content -LiteralPath $PidFile | Select-Object -First 1
+    Write-Host "Backend is already running (pid $existingPid)."
+    Write-Host "URL: $BackendPublicBaseUrl"
+    exit 0
+}
+
+if (-not (Test-Path -LiteralPath $BackendPython)) {
+    throw "Backend Python not found: $BackendPython. Run uv sync in offline-backend-20260512/backend first."
+}
+
+Remove-Item -LiteralPath $PidFile -Force -ErrorAction SilentlyContinue
+New-Item -ItemType Directory -Force -Path $BackendVendorDir | Out-Null
+
+Write-Host "Starting backend..."
+Write-Host "Log: $LogFile"
+
+$RunnerFile = Join-Path $RuntimeDir "run-backend.ps1"
+$runner = @"
+`$ErrorActionPreference = "Continue"
+Set-Location -LiteralPath $(ConvertTo-PSLiteral $BackendDir)
+`$env:GATEWAY_CORS_ORIGINS = $(ConvertTo-PSLiteral $GatewayCorsOrigins)
+`$env:PYTHONPATH = $(ConvertTo-PSLiteral ".;$BackendVendorDir")
+if (-not `$env:WEKNORA_ADMIN_PASSWORD) { `$env:WEKNORA_ADMIN_PASSWORD = "1qaz@WSX" }
+cmd.exe /c "`"$(($BackendPython -replace '"', '\"'))`" -m uvicorn app.gateway.app:app --host $(($BackendHost -replace '"', '\"')) --port $(($BackendPort -replace '"', '\"')) --reload > `"$(($LogFile -replace '"', '\"'))`" 2>&1"
+"@
+Set-Content -LiteralPath $RunnerFile -Value $runner -Encoding UTF8
+
+$proc = Start-Process -FilePath "powershell.exe" -ArgumentList @(
+    "-NoProfile",
+    "-ExecutionPolicy", "Bypass",
+    "-File", $RunnerFile
+) -WindowStyle Hidden -PassThru
+
+Set-Content -LiteralPath $PidFile -Value $proc.Id
+Write-Host "Backend started (pid $($proc.Id))."
+Write-Host "URL: $BackendPublicBaseUrl"