633092167c
Integrates the useful custom HTTP header support from #881 onto current main. - support root, provider-specific, and DEEPSEEK_HTTP_HEADERS overrides - apply validated extra headers to model API requests while preserving protected Authorization and Content-Type defaults - document the config shape in README, config.example.toml, and docs/CONFIGURATION.md Co-authored-by: Desheng <8596814+dst1213@users.noreply.github.com>