refactor: 架构重组 — doc/bot → core/infra，新增 Agent 调度模块

- src/doc/ 拆分为 src/core/extraction/, matching/, validation/（核心业务逻辑）
- src/bot/ 重命名为 src/infra/browser/（浏览器自动化基础设施）
- fill_consumable_doc.py → src/infra/documents/consumable.py
- 新增 Agent 调度模块：coordinator.py, events.py, session.py，重构 orchestrator.py
- 更新 AGENTS.md、README.md 及所有子目录 README

src/web/app.py

@@ -22,15 +22,22 @@ sys.path.insert(0, str(PROJECT_ROOT))
 from flask import Flask  # noqa: E402, I001
 
 from src.web import pipeline_web, routes  # noqa: E402, I001
-from src.doc.fill_consumable_doc import CONSUMABLE_DOC_FILENAME  # noqa: E402, I001
+from src.infra.documents import CONSUMABLE_DOC_FILENAME  # noqa: E402, I001
 
 app = Flask(__name__, template_folder="templates")
 
 UPLOAD_BASE = PROJECT_ROOT / "src" / "web" / "uploads"
 
+_app_initialized = False
+
 
 def create_app() -> Flask:
     """应用工厂：初始化配置并注册路由"""
+    global _app_initialized
+    if _app_initialized:
+        return app
+    _app_initialized = True
+
     # 设置出库单模板路径
     pipeline_web.set_consumable_template(PROJECT_ROOT / CONSUMABLE_DOC_FILENAME)