[WIP] Update README to include core features and routing functionalities

[Copilot]

• 1. English README (README.md) updates:
  • 1a. Core Features: Add local proxy forwarding OpenAI-compatible API endpoint feature (no extra plugins, just local URL + key, all traffic stays local)
  • 1b. Core Features: Add user-customizable L1 routing rules with LLM/NL/AI wizard auto-generation
  • 1c. New section: Local Proxy Forwarding endpoint — functionality and implementation principles
  • 1d. New section: Deep-dive into L0+ three-layer routing decision system (L0/L0.5/L1/L2/L3) with clarification that custom rules are L1
  • 1e. Comparison table: Add "no extra plugins needed" vs competitors row
  • 1f. Update Table of Contents for new sections
• 2. Chinese README (README.zh-CN.md) updates:
  • 2a. Core Features: Add local proxy forwarding feature description (Chinese)
  • 2b. Core Features: Add L1 custom routing + AI generation feature description (Chinese)
  • 2c. New section: Local proxy forwarding endpoint details (Chinese)
  • 2d. New section: Deep-dive L0+ routing layers (Chinese)
  • 2e. Comparison table: Add plugin-free row (Chinese)
  • 2f. Update Table of Contents for new sections (Chinese)
• 3. Final review and verification

Original prompt

在中英文readme：1）core features加一个对通过本地代理转发模拟open ai兼容api端口供openclaw等agent使用的优势特性描述，表示不需要额外安装任何插件，填入本地url端口和key即可使用。并声明是在本地转发不经过任何外部路径。然后在后面专门新增一个章节讲述这个本地代理转发端口功能和实现原理，具体信息请看代码。然后在同类产品对比章节增加一项同类产品需要额外插件vs本产品仅需本地url端口开箱即用的对比。2）core features加一个用户可以自定义L1层路由规则，并且可以通过lmm，自然语言描述需求或ai问卷向导自动生成路由规则的优势特性描述；3）进一步深入介绍L0+三层路由决策的各层路由决策功能和实现原理，其中需要明确用户自定义路由是用于L1规则路由，具体信息请看代码。

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