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>

themes/minimal/manifest.json

@@ -0,0 +1,54 @@
+{
+  "id": "minimal",
+  "name": "极简创意",
+  "description": "商业主题体验升级：独立视觉素材、响应式排版、产品列表筛选、多级导航、可访问性与交付检查（需真实内容验收）",
+  "version": "1.1.0",
+  "style": "editorial",
+  "entry": "pro.html",
+  "styles": [
+    "theme.css",
+    "blocks.css"
+  ],
+  "page_templates": [
+    "home",
+    "about",
+    "contact",
+    "listing",
+    "category",
+    "product",
+    "article",
+    "brand",
+    "case",
+    "service",
+    "faq",
+    "standard",
+    "notfound"
+  ],
+  "blocks": [
+    "hero",
+    "richtext",
+    "features",
+    "stats",
+    "collection",
+    "image_text",
+    "gallery",
+    "faq",
+    "cta",
+    "attributes",
+    "spacer"
+  ],
+  "responsive": true,
+  "auto_binding": true,
+  "professional_layout": true,
+  "commercial_ui": true,
+  "commercial_features": [
+    "responsive-design",
+    "product-detail",
+    "brand-collections",
+    "gallery",
+    "content-facets",
+    "mega-navigation",
+    "contact-integration",
+    "readiness-audit"
+  ]
+}