docs: add OrcaRouter as an OpenAI-compatible gateway example

[Marc-oss-hub]

Add OrcaRouter as a named OpenAI-compatible gateway example in the docs

Mirrors the existing OpenRouter wiring: the plugin itself is a generic URL-based client (per AGENTS.md, individual services are named only when they provide a useful configuration example), and OrcaRouter is exactly such an example — it exposes Anthropic Claude models through a standard OpenAI-compatible /v1/chat/completions endpoint (https://api.orcarouter.ai/v1/chat/completions).

Changes:

• docs/configuration_manual_EN.md: added OrcaRouter to the "Common examples" list (sorted after OpenRouter, before Vercel)
• docs/configuration_manual_CN.md: same entry in the Chinese manual
• docs/architecture.md: added OrcaRouter to the "Provider sources" list

The endpoint was live-verified against anthropic/claude-haiku-4.5 — it returns a standard chat.completion, so no provider-specific codec is needed (consistent with the architecture's "Rejected complexity" section).

OrcaRouter is an AI gateway that routes requests to Claude and OpenAI models through one unified endpoint. It also runs gateway-level, zero-trust security for AI agents on the same endpoint — screening every prompt/response and governing every tool call on a default-deny basis, with no application code changes.

I'm an engineer on the OrcaRouter team.

Summary by Sourcery

Documentation:

• Add OrcaRouter and its chat completions endpoint to the English and Chinese configuration manuals and provider source documentation.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds OrcaRouter as a documented OpenAI-compatible gateway example and provider source alongside existing gateways (OpenRouter, Vercel), updating both English and Chinese configuration manuals and the architecture overview to include its URL and reference link.

File-Level Changes

Change	Details	Files
Document OrcaRouter as an OpenAI-compatible chat completions gateway example in both EN and CN configuration manuals.	Expanded the common examples list of OpenAI-compatible endpoints to include OrcaRouter’s chat completions URL. Positioned OrcaRouter in the examples list immediately after OpenRouter and before Vercel to keep ordering consistent. Kept wording and formatting aligned with existing gateway examples to avoid introducing new concepts or special handling.	docs/configuration_manual_EN.md docs/configuration_manual_CN.md
Add OrcaRouter to the architecture docs as a provider source reference.	Extended the provider sources link list to include OrcaRouter as an additional OpenAI-compatible gateway. Placed the OrcaRouter link after OpenRouter and before the Vercel AI Gateway entry to mirror the configuration manuals’ ordering. Preserved the existing description style by adding only a bare link label and URL, matching surrounding entries.	docs/architecture.md

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