feat: FAQ/HowTo schema injection and SEO pipeline enhancement

- writer.py: inject_geo_metadata now detects content type (article/listicle/howto/faq/review) and injects appropriate JSON-LD (FAQPage, HowTo, ItemList)
- New helpers: _detect_content_type, _extract_faq_pairs, _extract_howto_steps
- outline.py: _extract_seo_keywords regex support for CJK
- prompt_loader.py: Minor update

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

scripts/outline.py

@@ -53,7 +53,7 @@ class Outliner:
         if m:
             return m.group(1).strip()[:300]
         # 回退：取所有 # 标签或关键词模式
-        keywords = re.findall(r'[#＃](\w{2,6})', research_notes)
+        keywords = re.findall(r'[#＃]([\u4e00-\u9fff\w]{2,6})', research_notes)
         if keywords:
             return "、".join(keywords[:5])
         return "暂无"