feat: rewrite cover generation — 480×800 portrait, themed AI backgrounds, two-layer pipeline

Made-with: Cursor

src/scheduler.py

@@ -78,11 +78,16 @@ class SchedulerManager:
             article_ids = [a.id for a in articles]
             headlines = [a.title for a in articles]
 
+            categories_list = []
+            for a in articles:
+                categories_list.extend(json.loads(a.categories))
+
             auto_pub = Setting.get("auto_publish", {})
             method = auto_pub.get("cover_method", "text")
 
             cover_path = generate_cover(
-                method, config.ISSUES_DIR, week_start, week_end, headlines
+                method, config.ISSUES_DIR, week_start, week_end,
+                headlines, categories_list
             )
             epub_path = build_epub(
                 week_start, week_end, article_ids, cover_path, config.ISSUES_DIR