feat: 支持 DeepSeek v3.1 代码生成

[niupilot]

摘要

实现了对 DeepSeek v3.1 的完整支持，用户现在可以将 CodeAgent 配置为使用 DeepSeek 作为代码生成提供商。

主要变更

• ✅ 添加 DeepSeek 配置结构和环境变量支持
• ✅ 实现本地 HTTP API 集成（支持 OpenAI 兼容的 /chat/completions 端点）
• ✅ 实现 Docker 容器集成模式
• ✅ 更新配置示例文件
• ✅ 添加单元测试确保功能正确性

配置示例

# 在 config.yaml 中添加
deepseek:
  api_key: your-deepseek-api-key-here
  base_url: https://api.deepseek.com
  model: deepseek-chat
  container_image: codeagent/deepseek-cli:latest
  timeout: 30m

# 设置为代码提供商
code_provider: deepseek
use_docker: false  # 使用本地 HTTP API 模式

环境变量支持

• DEEPSEEK_API_KEY - DeepSeek API 密钥
• DEEPSEEK_BASE_URL - API 基础地址（默认: https://api.deepseek.com）
• DEEPSEEK_MODEL - 使用的模型（默认: deepseek-chat）
• CODE_PROVIDER=deepseek - 设置为 DeepSeek 提供商

测试计划

• 代码编译通过
• 单元测试通过
• 配置加载正确
• 集成测试（需要真实 API 密钥）

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[niupilot]

🔍 Code Review for DeepSeek v3.1 Integration

Review Checklist:

• Read and analyze all changed files
• Review code quality and architecture decisions
• Check for potential bugs and security issues
• Evaluate configuration and environment handling
• Review test coverage and implementation
• Check documentation consistency
• Provide comprehensive feedback and suggestions

Starting code review...

[niupilot]

🔍 Code Review Complete

Overall Assessment ✅

This PR successfully implements DeepSeek v3.1 integration following existing codebase patterns. Clean and well-structured implementation.

Strengths

• Consistent with Claude/Gemini provider patterns
• Proper config integration with env vars
• Good error handling and timeouts
• OpenAI-compatible API structure
• Secure API key handling

Issues Found ⚠️

Docker Implementation (deepseek_docker.go:138)

"deepseek-cli", // May not exist in container

Hardcoded CLI tool assumption needs verification.

Recommendations

Required:

• Document/fix deepseek-cli assumption
• Verify container image availability

Suggested:

• Add mock tests
• Update README.md
• Add retry logic

Status: Ready for merge with Docker clarification

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