fix(dashboard): warm cache after AI pick refresh

scheduler.py

@@ -2071,6 +2071,7 @@ def run_pchome_match_backfill_task():
         from config import DATABASE_PATH
         from sqlalchemy import create_engine
         from services.ai_product_pick_agent import generate_product_pick_list
+        from services.cache_manager import clear_dashboard_cache
         from services.competitor_price_feeder import CompetitorPriceFeeder
 
         now_str = datetime.now(TAIPEI_TZ).strftime('%Y-%m-%d %H:%M')
@@ -2079,6 +2080,7 @@ def run_pchome_match_backfill_task():
         engine = create_engine(DATABASE_PATH)
         feeder_result = CompetitorPriceFeeder(engine=engine).run_unmatched_priority(limit=120)
         pick_result = generate_product_pick_list(engine, limit=50)
+        clear_dashboard_cache()
 
         stats = {
             "total_skus":        feeder_result.total_skus,