docs: update README and AGENTS for LLM provider changes

- Add agent command documentation
- Add Provider Type configuration (openai/anthropic/openrouter/ollama)
- Update tech stack to reflect custom LLM implementation

Author: liut

AGENTS.md

@@ -21,7 +21,7 @@ Morrigan 是一个基于 PostgreSQL + Redis 的知识库系统后端，用于 AI
 - **Web 框架**: chi/v5
 - **数据库**: PostgreSQL (含 vector 扩展)
 - **缓存/会话**: Redis
-- **AI SDK**: github.com/sashabaranov/go-openai (deprecated, use pkg/services/llm)
+- **LLM**: 自定义实现 (pkg/services/llm)，支持 OpenAI/Anthropic/OpenRouter/Ollama
 - **MCP**: github.com/mark3labs/mcp-go
 - **ORM**: github.com/uptrace/bun
 
@@ -84,9 +84,16 @@ Morrigan 是一个基于 PostgreSQL + Redis 的知识库系统后端，用于 AI
 
 ### main.go
 
-- 定义 CLI 命令: `initdb`, `import`, `embedding`, `web`, `usage`, `version`
+- 定义 CLI 命令: `initdb`, `import`, `embedding`, `agent`, `web`, `usage`, `version`
 - 启动 Web 服务器逻辑
 
+### pkg/services/llm/
+
+- LLM 统一客户端接口，支持多种 Provider
+- `Client` 接口: `Chat`, `StreamChat`, `Generate`, `Embedding`
+- 支持的 Provider: `openai`, `anthropic`, `openrouter`, `ollama`
+- `anthropic.go`: Anthropic Provider 实现，包含流式响应支持
+
 ### pkg/web/server.go
 
 - Web 服务器主文件

README.md

@@ -189,6 +189,7 @@ COMMANDS:
    import                       import documents from a csv
    export                       export documents to csv/jsonl
    embedding, embedding-prompt  read prompt documents and embedding
+   agent, llm, chat            test LLM agent
    web, run                     run a web server
    version, ver                 show version
    help, h                      Shows a list of commands or help for one command
@@ -198,6 +199,26 @@ GLOBAL OPTIONS:
 
 ```
 
+#### Agent Command
+
+测试 LLM 功能的命令行工具：
+
+```bash
+# 非流式对话
+forego run go run . agent -m "你好"
+
+# 流式对话
+forego run go run . agent -m "你好" -s
+
+# 显示详细日志
+forego run go run . agent -m "你好" -v
+```
+
+参数：
+- `-m, --message`: 发送的消息 (必填)
+- `-s, --stream`: 启用流式响应
+- `-v, --verbose`: 显示日志 (默认关闭)
+
 
 ### Change settings with environment
 
@@ -249,22 +270,32 @@ HTTPS_PROXY=socks5://proxy.my-company.xyz:1081
 
 #### Provider Configuration (AI Services)
 
-Each provider requires `API_KEY` and `MODEL`, optional `URL` for custom endpoints:
+Each provider requires `API_KEY` and `MODEL`, optional `URL` and `TYPE` for custom endpoints:
 
 | Provider | Purpose | Required Variables |
 |----------|---------|-------------------|
 | `INTERACT` | Chat/completion | `API_KEY`, `MODEL` |
 | `EMBEDDING` | Vector embedding | `API_KEY`, `MODEL` |
 | `SUMMARIZE` | Text summarization | `API_KEY`, `MODEL` |
 
+支持的 Provider Type: `openai`, `anthropic`, `openrouter`, `ollama`
+
 Example:
 ```
+# Interact provider (支持 openai/anthropic/openrouter/ollama)
 MORRIGAN_INTERACT_API_KEY=sk-xxx
 MORRIGAN_INTERACT_MODEL=gpt-4o-mini
+MORRIGAN_INTERACT_TYPE=openai  # 可选，默认 openai
+
+# 使用 Anthropic
+MORRIGAN_INTERACT_TYPE=anthropic
+MORRIGAN_INTERACT_MODEL=claude-3-5-sonnet
 
+# Embedding provider
 MORRIGAN_EMBEDDING_API_KEY=sk-xxx
 MORRIGAN_EMBEDDING_MODEL=text-embedding-3-small
 
+# Summarize provider
 MORRIGAN_SUMMARIZE_API_KEY=sk-xxx
 MORRIGAN_SUMMARIZE_MODEL=gpt-4o-mini
 ```