refactor(templates): 統一模板目錄並移除 fallback loader

ADR-017 Phase 3f-4：根目錄模板搬入 templates/，補 trends/login_history，移除 ChoiceLoader 根目錄 fallback，搬移 components，刪除 web/templates 下的空檔/死檔與 compose 舊模板 mount。

docker-compose.yml

@@ -67,27 +67,6 @@ services:
       # HTML 模板 (熱更新)
       - ./templates:/app/templates:ro
       - ./web/templates:/app/web/templates:ro
-      - ./login.html:/app/login.html:ro
-      - ./dashboard.html:/app/dashboard.html:ro
-      - ./daily_sales.html:/app/daily_sales.html:ro
-      - ./sales_analysis.html:/app/sales_analysis.html:ro
-      - ./growth_analysis.html:/app/growth_analysis.html:ro
-      - ./monthly_summary_analysis.html:/app/monthly_summary_analysis.html:ro
-      - ./edm_dashboard.html:/app/edm_dashboard.html:ro
-      - ./index.html:/app/index.html:ro
-      - ./logs.html:/app/logs.html:ro
-      - ./auto_import_index.html:/app/auto_import_index.html:ro
-      - ./settings.html:/app/settings.html:ro
-      - ./system_settings.html:/app/system_settings.html:ro
-      # 其他根目錄路由
-      - ./auto_import_routes.py:/app/auto_import_routes.py:ro
-      - ./crawler_management_routes.py:/app/crawler_management_routes.py:ro
-      - ./import.html:/app/import.html:ro
-      # AI 助手模板及相關依賴
-      - ./templates/ai_recommend.html:/app/ai_recommend.html:ro
-      - ./templates/ai_history.html:/app/ai_history.html:ro
-      - ./templates/base.html:/app/base.html:ro
-      - ./web/templates/components:/app/components:ro
     environment:
       - FLASK_ENV=production
       - PYTHONUNBUFFERED=1