feat: add Bearer Token support and auto-detection for API auth

[cherryepbz-cyber]

🚀 功能改进：支持 Bearer Token 自动识别与多模型适配

feat: add Bearer Token support and auto-detection logic

🇨🇳 中文描述 (Chinese Description)

💡 改进背景

当前的认证方式主要硬编码支持 x-api-key。为了让本项目能够无缝兼容更多主流 AI 提供商（如 OpenAI, DeepSeek, 或是用户自建的 API 代理网关），我增加了对标准 Authorization: Bearer 格式的支持。

🛠️ 主要改动

1. 自动识别逻辑：全面更新了 agents/ 目录下的所有脚本（s01-s12）。系统现在会根据环境变量自动判断采用哪种请求头。
2. 环境变量模板：在 .env.example 中增加了 BEARER_TOKEN 占位符。
3. 架构对齐：在代码注释中强化了“模型即智能，代码即装甲 (Model is Agent, Code is Harness)”的工程哲学。

🧪 验证结果

• API_KEY 模式：设置 API_KEY 时，请求头包含 x-api-key，运行正常。
• BEARER_TOKEN 模式：设置 BEARER_TOKEN 时，请求头包含 Authorization: Bearer，运行正常。

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🇺🇸 English Description

💡 Context

The current implementation primarily supports x-api-key. To ensure compatibility with a wider range of AI providers (e.g., OpenAI, DeepSeek, or custom API gateways), I have added support for the standard Authorization: Bearer format.

🛠️ Key Changes

1. Auto-detection Logic: Updated all scripts in the agents/ directory (s01-s12). The system now automatically determines the appropriate header based on the available environment variables.
2. Template Update: Added the BEARER_TOKEN placeholder to .env.example.
3. Narrative Alignment: Maintained consistency with the "Model is Agent, Code is Harness" engineering philosophy throughout the codebase.

🧪 Verification

• API_KEY Mode: Verified that requests function correctly with x-api-key.
• BEARER_TOKEN Mode: Verified that requests function correctly with Authorization: Bearer.

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Submitted by @cherryepbz-cyber

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