ANTHROPIC_DEFAULT_HAIKU_MODEL in base-codex.settings.json is set to
gpt-5-mini which is not routable on the codex CLIProxy endpoint,
causing 502 'unknown provider for model gpt-5-mini' when Claude Code
spawns subagents at the haiku tier.
The correct model ID is gpt-5-codex-mini (confirmed via /v1/models).
Ref: #602
- Add unified CLIProxy config supporting all providers concurrently
- Move CLIProxy files to ~/.ccs/cliproxy/ subdirectory
- Use flat auth directory structure for OAuth tokens
- Add provider-specific URL routing via /api/provider/{provider}
- Add base settings templates for gemini and codex
- Fix model registration with proper auth file discovery
Enables users to run `ccs gemini` and `ccs codex` concurrently
without config conflicts.