chore: import SiteForge Factory V5 source (baseline)

导入 SiteForge Factory V5 基线源码：
- FastAPI + SQLite + Docker Compose（Web + Worker）架构
- 四套商业主题 × 14 页面模板（1.1.0，含历史版本快照）
- 四种建站模式骨架 + 迁移审计 + 发布门禁
- 52 项 pytest 测试
- 补全计划主文档 docs/superpowers/plans/

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

scripts/check.ps1

@@ -0,0 +1,25 @@
+param(
+    [string]$Python = "python"
+)
+
+$ErrorActionPreference = "Stop"
+
+& $Python -m pip check
+if ($LASTEXITCODE -ne 0) { throw "Python dependency check failed" }
+
+& $Python -m compileall -q app
+if ($LASTEXITCODE -ne 0) { throw "Python compilation failed" }
+
+& $Python -m pytest -q --basetemp=.pytest_cache/check-tmp
+if ($LASTEXITCODE -ne 0) { throw "Pytest failed" }
+
+if (Get-Command node -ErrorAction SilentlyContinue) {
+    foreach ($file in @("app/static/admin.js", "app/static/editor.js", "app/static/factory-v2.js", "app/static/pro.js")) {
+        & node --check $file
+        if ($LASTEXITCODE -ne 0) { throw "JavaScript syntax check failed: $file" }
+    }
+} else {
+    Write-Warning "Node.js is unavailable; JavaScript syntax checks were skipped."
+}
+
+Write-Host "SiteForge V5 checks passed."