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

tests/test_matcher.py

@@ -12,7 +12,7 @@ from __future__ import annotations
 
 from typing import Any
 
-from src.doc.matcher import (
+from src.core.matching import (
     _build_invoice_summary,
     _build_payment_records,
     _invoices_to_records,