Add OrcaRouter as a named provider platform · Pull Request !1 · AIDotNet/Thor

[OrcaRouter](https://www.orcarouter.ai) is an OpenAI-compatible LLM routing gateway. This PR adds OrcaRouter as a named provider, mirroring the existing DeepSeek integration.

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.

### Changes

- **New extension `src/extensions/Thor.OrcaRouter/`**: a named OrcaRouter platform (`PlatformCode = "OrcaRouter"`), mirroring the DeepSeek extension structure:
  - `OrcaRouterPlatformOptions.cs` — platform name/code
  - `Chats/OrcaRouterChatCompletionsService.cs` — OpenAI-compatible chat completions (non-stream + SSE stream) defaulting to `https://api.orcarouter.ai`
  - `Extensions/OrcaRouterServiceCollectionExtensions.cs` — registers the platform in `ThorGlobal.PlatformNames` / `ModelNames`, keyed chat service, and HTTP client
  - `Thor.OrcaRouter.csproj`
- **`src/Thor.Service/Program.cs`** — registers `.AddOrcaRouterService()`
- **`src/Thor.Service/Thor.Service.csproj`** — project reference to the new extension
- **`Thor.sln`** — solution entry + build configurations
- **`README.md` / `README.zh-cn.md`** — added OrcaRouter to the supported OpenAI-compatible models list

The platform appears automatically in the channel-creation UI (types/models are loaded from `ThorGlobal`), so users can select OrcaRouter by name.

### Verification

- `dotnet build Thor.sln` — succeeded, 0 errors (restored from nuget.org; only pre-existing NU1902/NU1903 package-vulnerability warnings remain, which are unrelated to this change)
- L3 live test against the new provider path (POST `https://api.orcarouter.ai/v1/chat/completions` with a model from the default list):
  - non-stream: `HTTP 200`, returned `content: OK`
  - stream: SSE `chat.completion.chunk` deltas returned normally

Disclosure: I'm an engineer on the OrcaRouter team.

类型	指派人员	状态
审查	Token	进行中 (0/1人)
测试	Token	进行中 (0/1人)

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