修复环境变量，UI问题

api/app/tasks/story_image_tasks.py

@@ -19,6 +19,7 @@ from app.core.logging import get_logger
 from app.core.redis_lock import acquire_redis_lock, release_redis_lock
 from app.features.asset.models import Asset
 from app.features.memoir.asset_resolver import strip_asset_image_refs_from_markdown
+from app.features.memoir.memoir_images.settings import MemoirImageSettings
 from app.features.memoir.memoir_images.storage import TencentCosStorageService
 from app.features.story.backfill import backfill_image_into_markdown
 from app.features.story.models import Story, StoryImageIntent, StoryVersion
@@ -178,11 +179,34 @@ def generate_story_image(self, story_id: str):
 
             intent, story = row
 
+        img_cfg = MemoirImageSettings.from_env()
+        min_body = img_cfg.story_image_min_body_chars
+        if min_body > 0:
+            plain = strip_asset_image_refs_from_markdown(
+                story.canonical_markdown or ""
+            ).strip()
+            if len(plain) < min_body:
+                with get_sync_db() as db:
+                    intent_db = db.get(StoryImageIntent, intent.id)
+                    if intent_db and (intent_db.status or "").strip() == "processing":
+                        intent_db.status = "skipped"
+                        intent_db.error = f"body_below_min_chars:{len(plain)}"
+                        intent_db.claim_token = None
+                        intent_db.claimed_at = None
+                        intent_db.updated_at = datetime.now(timezone.utc)
+                        db.commit()
+                logger.info(
+                    "generate_story_image: skipped body too short story=%s len=%s min=%s",
+                    story_id,
+                    len(plain),
+                    min_body,
+                )
+                return {"status": "skipped_body_too_short"}
+
         image_generator = get_image_generator()
         storage = TencentCosStorageService.from_env()
-        from app.features.memoir.memoir_images.settings import MemoirImageSettings
 
-        settings = MemoirImageSettings.from_env()
+        settings = img_cfg
         prompt_final = _build_story_image_prompt(
             intent.prompt_brief or "",
             story_title=story.title or "",