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* feat(routing): self-hosted unified OpenAI-compatible entry (RIC-738) Divert /v1/chat/completions through the self-hosted provider adapters when OMNIROUTE_SELF_HOSTED_PROVIDERS / OMNIROUTE_SELF_HOSTED_PROVIDERS_FILE is set: one OpenAI-compatible contract in, auto-route to the selected provider (x-omniroute-provider header, provider/model prefix, or first provider), standard OpenAI error shape out. Optional OMNIROUTE_SELF_HOSTED_API_KEY guards the entry (D5 reserved); unset = open loopback route. Upstream credentials stay runtime-only and are stripped from echoed responses. Brings in the provider-adapters baseline from sibling branch (RIC-737) that this entry depends on. Includes 21 passing unit tests (provider selection, model-prefix forwarding, header hygiene, auth, error normalization, SSE passthrough, fall-through/misconfig), docs, env example, changelog fragment. * feat(routing): deterministic routing strategies for self-hosted entry (RIC-740) Add the M2 deterministic routing strategy engine (D3 可审计路由) to the self-hosted unified entry: a declarative `strategy:` block expressing five explainable, non-predictive policies — blacklist/whitelist hard filters, cooldown circuit breaker, cost-priority, latency-aware ordering, and an explicit fallback chain. The ordered candidate list is the fallback chain: a failed primary (network or non-2xx) falls through to the next candidate and each failure feeds the breaker. Every response carries an x-omniroute-route-decision header answering "why this model / why not that one". A pinned provider rejected by a hard filter returns 400 (never a silent re-route); no eligible providers returns 503 with the full explainable decision. No ML/predict dependency. Covers the RIC-740 acceptance: 5 strategy types with unit tests + HTTP fault-injection tests (primary down -> fallback works), config matching docs, and no predict/ML deps. Adds docs, .env.example entries, and a changelog fragment. * refactor(routing): reduce complexity-ratchet violations in new self-hosted routing files Extract cost/id validation, pin-blocked resolution, ordering, and env/file source resolution into small helpers so routingStrategies.ts and selfHostedEntry.ts stay under the complexity-ratchets cap. No behavior change — the same 51 routing-strategies/self-hosted-entry/provider-adapters tests pass unmodified. Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com> * docs(routing): document the 5 self-hosted env vars in ENVIRONMENT.md check:env-doc-sync failed because OMNIROUTE_SELF_HOSTED_PROVIDERS(_FILE), OMNIROUTE_SELF_HOSTED_API_KEY and OMNIROUTE_SELF_HOSTED_STRATEGY(_FILE) were present in .env.example but missing from docs/reference/ENVIRONMENT.md. Add them under "6. Tool & Routing Policies". Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com> --------- Co-authored-by: Ant Rich <ant@richants.com> Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com> Co-authored-by: luyuehm <luyuehm@users.noreply.github.com>