feat: add Chinese UI, Responses models, and mirrored Windows setup

Localize the web console and persist custom model and capability settings.
Use OpenAI Responses exclusively and move runtime limits into environment configuration.
Bootstrap uv and the virtual environment on Windows, support optional China mirrors,
and package source distributions without environments, build output, or credentials.

Update regression tests and repository quality checks for the new behavior.

scripts/bootstrap_python.ps1

@@ -0,0 +1,85 @@
+# Python bootstrap shared by the Windows launcher and its isolated checks.
+# Keep this file ASCII for Windows PowerShell 5.1.
+
+function Initialize-ArtemisPython {
+    param([Parameter(Mandatory=$true)][string]$ProjectRoot)
+
+    $ProjectRoot = (Resolve-Path -LiteralPath $ProjectRoot -ErrorAction Stop).Path
+    if (-not (Test-Path -LiteralPath (Join-Path $ProjectRoot 'pyproject.toml'))) {
+        throw 'pyproject.toml is missing. Extract the complete source archive first.'
+    }
+    if (-not (Test-Path -LiteralPath (Join-Path $ProjectRoot 'uv.lock'))) {
+        throw 'uv.lock is missing. Extract the complete source archive first.'
+    }
+
+    if (-not (Test-CommandExists 'uv')) {
+        if ($ArtemisDownloads -and $ArtemisDownloads.python_index) {
+            Write-Host '   [INSTALL] Installing uv from the selected Python mirror...' -ForegroundColor Cyan
+            Install-ArtemisUvFromIndex -IndexUrl $ArtemisDownloads.python_index
+        } else {
+            Write-Host '   [INSTALL] uv was not found. Installing from the configured installer...' -ForegroundColor Cyan
+            $installer = Join-Path ([IO.Path]::GetTempPath()) ('artemis-uv-' + [guid]::NewGuid().ToString('N') + '.ps1')
+            try {
+                $installerUrl = if ($ArtemisDownloads) { $ArtemisDownloads.uv_installer_url } else { 'https://astral.sh/uv/install.ps1' }
+                if (-not (Invoke-DownloadFile -Uri $installerUrl -OutFile $installer)) {
+                    throw 'Could not download uv. Check your network/proxy and retry.'
+                }
+                & powershell.exe -NoProfile -ExecutionPolicy Bypass -File $installer | Out-Host
+                if ($LASTEXITCODE -ne 0) { throw "uv installation failed (exit $LASTEXITCODE)." }
+            } finally {
+                Remove-Item -LiteralPath $installer -Force -ErrorAction SilentlyContinue
+            }
+        }
+        Update-EnvironmentPath
+    } else {
+        Write-Host '   [SKIP] uv is already installed.' -ForegroundColor Green
+    }
+    if (-not (Test-CommandExists 'uv')) { throw 'uv is still unavailable. Install it from https://astral.sh/uv/ and retry.' }
+    & uv --version | Out-Host
+    if ($LASTEXITCODE -ne 0) { throw 'The installed uv could not run. Repair its installation and retry.' }
+
+    $venvDir = Join-Path $ProjectRoot '.venv'
+    $pythonExe = Join-Path $venvDir 'Scripts\python.exe'
+    $previousEnvironment = $env:UV_PROJECT_ENVIRONMENT
+    $env:UV_PROJECT_ENVIRONMENT = $venvDir
+    Push-Location -LiteralPath $ProjectRoot
+    try {
+        if (-not (Test-Path -LiteralPath $venvDir)) {
+            Write-Host '   [INSTALL] Creating .venv with Python 3.12 (downloaded automatically if needed)...' -ForegroundColor Cyan
+            & uv venv --python 3.12 $venvDir | Out-Host
+            if ($LASTEXITCODE -ne 0) { throw 'Could not create .venv. Check the download errors above and retry.' }
+        } else {
+            Write-Host '   [SKIP] Reusing the existing project .venv.' -ForegroundColor Green
+        }
+        if (-not (Test-Path -LiteralPath $pythonExe)) {
+            throw 'The existing .venv is incomplete. Rename it as a backup, then rerun start.bat.'
+        }
+        & $pythonExe -c 'import sys; sys.exit(0 if sys.version_info >= (3, 12) and sys.prefix != sys.base_prefix else 1)' | Out-Host
+        if ($LASTEXITCODE -ne 0) {
+            throw 'The existing .venv is unusable or older than Python 3.12. Rename it as a backup, then rerun start.bat.'
+        }
+
+        # A cheap check skips installation when the lock and installed packages agree.
+        # --inexact preserves any optional development tools already installed.
+        $lockOption = if ($ArtemisDownloads -and $ArtemisDownloads.python_index) { '--frozen' } else { '--locked' }
+        & uv sync --check $lockOption --no-dev --inexact --quiet 2>$null | Out-Host
+        if ($LASTEXITCODE -eq 0) {
+            Write-Host '   [SKIP] Python dependencies are already ready.' -ForegroundColor Green
+        } else {
+            Write-Host '   [INSTALL] Synchronizing dependencies from uv.lock...' -ForegroundColor Cyan
+            if ($ArtemisDownloads -and $ArtemisDownloads.python_index) {
+                Install-ArtemisLockedDependencies -PythonExe $pythonExe -IndexUrl $ArtemisDownloads.python_index
+            } else {
+                & uv sync --locked --no-dev --inexact | Out-Host
+                if ($LASTEXITCODE -ne 0) { throw 'Dependency installation failed. Fix the error above and rerun start.bat.' }
+            }
+        }
+        & $pythonExe -c 'import artemis, uvicorn, fastapi, langchain_openai' | Out-Host
+        if ($LASTEXITCODE -ne 0) { throw 'Python dependency verification failed. The UI will not be started.' }
+        Write-Host '   [OK] Python environment is ready.' -ForegroundColor Green
+        return $pythonExe
+    } finally {
+        Pop-Location
+        $env:UV_PROJECT_ENVIRONMENT = $previousEnvironment
+    }
+}