build: add pyinstaller packaging

scripts/build_exe.ps1

@@ -0,0 +1,54 @@
+$ErrorActionPreference = "Stop"
+
+$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+$repoRoot = Resolve-Path (Join-Path $scriptDir "..")
+Set-Location $repoRoot
+
+$pythonVersion = python -c "import sys; print('%d.%d.%d' % sys.version_info[:3])"
+Write-Host "Using Python: $pythonVersion"
+if ([version]$pythonVersion -lt [version]"3.10.0") {
+    Write-Warning "Project target is Python 3.10+. Switch to a 3.10+ environment before official release builds."
+}
+$spec = Join-Path $repoRoot "cmshopee.spec"
+if (-not (Test-Path -LiteralPath $spec)) {
+    throw "Missing cmshopee.spec"
+}
+
+python -m PyInstaller --noconfirm --clean $spec
+
+$distDir = Join-Path $repoRoot "dist\cmshopee"
+$exePath = Join-Path $distDir "cmshopee.exe"
+if (-not (Test-Path -LiteralPath $exePath)) {
+    throw "Build failed: $exePath not found"
+}
+
+$excluded = @(
+    "config.json",
+    "config\ai_models.json",
+    "cmshopee.db",
+    "cmshopee.db-wal",
+    "cmshopee.db-shm",
+    "db.sqlite",
+    "chrome_user_data_dir",
+    "images",
+    "logs",
+    "prompts",
+    "title_prompt.txt"
+)
+
+$found = @()
+foreach ($relative in $excluded) {
+    $candidate = Join-Path $distDir $relative
+    if (Test-Path -LiteralPath $candidate) {
+        $found += $relative
+    }
+}
+
+if ($found.Count -gt 0) {
+    throw "Build output contains local user data: $($found -join ', ')"
+}
+
+Write-Host "Build complete: $exePath"
+Write-Host "Do not copy local data into the release package."
+
+