Add claudeCodeMode configuration option to emulate Claude Code client
requests, enabling OAuth token authentication with Claude API.
Changes:
- Add claudeCodeMode config field in ProviderConfig
- Transform request headers for Claude Code mode:
- Use Bearer token authorization instead of x-api-key
- Set user-agent to claude-cli/2.1.2 (external, cli)
- Set x-app: cli header
- Set anthropic-beta with OAuth and Claude Code features
- Add ?beta=true query parameter to path
- Add cache_control with ephemeral type to system prompts in Claude Code mode
This allows users to use Claude Code OAuth tokens with Higress AI proxy.
caf910cf48