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/pages/article.html

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+<section class="pro-article-hero"><div class="pro-wrap pro-article-width"><span class="pro-eyebrow">LATEST NEWS / INSIGHTS</span><h1>{{page.title}}</h1><p>{{page.summary}}</p>{% if fields.get('publish_date') %}<time>{{fields.get('publish_date')}}</time>{% endif %}</div></section><article class="pro-wrap pro-article-content">{% if page.cover %}<img class="pro-article-cover" src="{{safe_image(page.cover)}}" alt="{{page.title}}">{% endif %}{{body_copy(content,page)}}<a class="pro-text-link" href="/news/">← 返回新闻</a></article>