Update CLIProxyAPI to v6.9.1 in go.mod and go.sum

Update CLIProxyAPI to v6.8.47 and bump Go version to 1.26.0

Remove `AccessAuthMiddleware` and associated test cases

Refactor access authentication framework:

Add multi-arch Docker workflows for amd64 and arm64 builds

Update CLIProxyAPI to v6.7.34 and add refraction-networking/utls dependency in go.mod and go.sum

feat: refactor to support model_id lookups and raw payloads

Update CLIProxyAPI to version v6.7.24 in go.mod and go.sum

Add user-specific API key management for admins

Rename 'User Group' to 'Auth Group' and update database logic

Add caching mechanism for version check in API and frontend

Add multi-filter support for billing rules in admin UI

Add inline price editor for billing rules in admin UI

Add versioning system and batch import functionality

Add structured logging and font assets