feat: docs update

docs/en/intro/architecture.mdx

@@ -0,0 +1,71 @@
+---
+title: Architecture
+description: CowAgent 2.0 system architecture and core design
+---
+
+CowAgent 2.0 has evolved from a simple chatbot into a super intelligent assistant with Agent architecture, featuring autonomous thinking, task planning, long-term memory, and skill extensibility.
+
+## System Architecture
+
+CowAgent's architecture consists of the following core modules:
+
+<img src="https://cdn.link-ai.tech/doc/68ef7b212c6f791e0e74314b912149f9-sz_5847990.png" alt="CowAgent Architecture" />
+
+### Core Modules
+
+| Module | Description |
+| --- | --- |
+| **Channels** | Message channel layer for receiving and sending messages. Supports Web, Feishu, DingTalk, WeCom, WeChat Official Account, and more |
+| **Agent Core** | Agent engine including task planning, memory system, and skills engine |
+| **Tools** | Tool layer for Agent to access OS resources. 10+ built-in tools |
+| **Models** | Model layer with unified access to mainstream LLMs |
+
+## Agent Mode Workflow
+
+When Agent mode is enabled, CowAgent runs as an autonomous agent with the following workflow:
+
+1. **Receive Message** — Receive user input through channels
+2. **Understand Intent** — Analyze task requirements and context
+3. **Plan Task** — Break complex tasks into multiple steps
+4. **Invoke Tools** — Select and execute appropriate tools for each step
+5. **Update Memory** — Store important information in long-term memory
+6. **Return Result** — Send execution results back to the user
+
+## Workspace Directory Structure
+
+The Agent workspace is located at `~/cow` by default and stores system prompts, memory files, and skill files:
+
+```
+~/cow/
+├── system.md          # Agent system prompt
+├── user.md            # User profile
+├── memory/            # Long-term memory storage
+│   ├── core.md        # Core memory
+│   └── daily/         # Daily memory
+├── skills/            # Custom skills
+│   ├── skill-1/
+│   └── skill-2/
+└── .env               # Secret keys for skills
+```
+
+## Core Configuration
+
+Configure Agent mode parameters in `config.json`:
+
+```json
+{
+  "agent": true,
+  "agent_workspace": "~/cow",
+  "agent_max_context_tokens": 40000,
+  "agent_max_context_turns": 30,
+  "agent_max_steps": 15
+}
+```
+
+| Parameter | Description | Default |
+| --- | --- | --- |
+| `agent` | Enable Agent mode | `true` |
+| `agent_workspace` | Workspace path | `~/cow` |
+| `agent_max_context_tokens` | Max context tokens | `40000` |
+| `agent_max_context_turns` | Max context turns | `30` |
+| `agent_max_steps` | Max decision steps per task | `15` |