fix: pipeline content tracking + topic article preview

db_helper.py: save_article now calculates and persists word_count
generator.py: run_creator_blocking sets word_count for HTML-imported articles
writer.py: fix title regex stripping content-leading numbers (35岁后→岁后)
trends.py: fix Baidu hot_score str/int type comparison crash
database.py: add missing content_tasks.org_id ALTER TABLE migration
schemas.py + topics.py: topic list API returns article_count + articles[] previews
topics.html: table view and card view show article badges with word counts, clickable to open preview

Ultraworked with Sisyphus

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

scripts/db_helper.py

@@ -246,12 +246,14 @@ def save_article(topic_id: str, platform: str, html_content: str, *, title: str
         from app.models import Article
         article_id = f"{platform}_{topic_id}"
         existing = db.query(Article).filter(Article.id == article_id).first()
+        word_count = len(content) if content else (len(html_content) if html_content else 0)
         if existing:
             existing.html_content = html_content
             if title:
                 existing.title = title
             if content:
                 existing.content = content
+            existing.word_count = word_count
         else:
             article = Article(
                 id=article_id,
@@ -261,6 +263,7 @@ def save_article(topic_id: str, platform: str, html_content: str, *, title: str
                 title=title,
                 content=content,
                 html_content=html_content,
+                word_count=word_count,
                 status="draft",
                 compliance_score=None
             )