Add core database support and enhance documentation

- Introduced `MYSQL_CORE_DATABASE` in `.env.example` and `settings.py` for core database configuration.
- Added `CoreReadOnlyRepository` for read-only access to the `jinrong_core` database.
- Updated `AGENTS.md`, `README.md`, and various documentation files to reflect new agent onboarding processes and project structure.
- Revised requirements in `requirements.txt` to include `langgraph` and `langchain-core`.
- Enhanced `FLOW.md` with local bootstrap instructions for setting up the core simulation environment.
- Added new scripts for database creation and seeding for the core simulation library.
- Improved overall documentation for clarity on project architecture and memory management.
- Updated `TODO.md` to reflect current development priorities and tasks.

README.md

@@ -6,7 +6,7 @@
 
 | 目录 | 内容 |
 | --- | --- |
-| [docs/memory/MEMORY.md](docs/memory/MEMORY.md) | 项目记忆入口（Agent 先读） |
+| [docs/memory/MEMORY.md](docs/memory/MEMORY.md) | 项目记忆入口（**新 Agent 读 §0 交接清单**） |
 | [docs/需求拆解/](docs/需求拆解/) | 业务场景、数据矩阵、合规 |
 | [docs/项目框架设计/](docs/项目框架设计/) | 表设计、技术选型、JWT 手册 |
 
@@ -18,6 +18,7 @@ app/
 ├── service/      # Agent、RAG、记忆
 ├── tool/         # 解析、Embedding、Milvus
 ├── model/        # Pydantic + ORM
+├── repository/   # Core 只读 core_ro（已实现）
 ├── config/       # settings、database
 ├── utils/
 └── main.py
@@ -33,6 +34,7 @@ app/
 ```bash
 cp .env.example .env
 pip install -r requirements.txt
+# 首次：灌 Core 模拟库与同步 — 见 docs/memory/FLOW.md §0
 uvicorn app.main:app --reload
 ```