feat(ai): 新增 OrcaRouter AI 协议支持 · Pull Request !158 · dromara/mayfly-go

[OrcaRouter](https://www.orcarouter.ai) is an OpenAI-compatible LLM routing gateway. This PR adds OrcaRouter as a named AI protocol in mayfly-go, mirroring the existing OpenAI protocol 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.

### 改动内容

镜像现有 `openai` 协议接法，新增命名 OrcaRouter 协议：

- **新增** `server/internal/ai/protocol/orcarouter.go`：
  - `OrcaRouter` 协议实现 `Protocol` 接口（`Name()` 返回 `orcarouter`）
  - `NewChatModel` 基于 eino OpenAI 兼容模型，默认 base-url `https://api.orcarouter.ai/v1`（`orcaRouterBaseURL`，用户自填 baseUrl 时优先生效），模型标识 `orcarouter/orcarouter/auto`
- `server/internal/ai/protocol/protocol.go`：增 `ProtocolOrcaRouter = "orcarouter"` 常量
- `server/internal/ai/protocol/registry.go`：`init()` 注册 `Register(new(OrcaRouter))`
- **前端** `frontend/src/i18n/{en,zh-cn}/system.ts`：AI 模型配置占位提示加 orcarouter 示例（`orcarouter/orcarouter/auto`）

使用方式：在 AI 模型配置中填 `模型 = orcarouter/orcarouter/auto`、`地址` 可留空（默认 `https://api.orcarouter.ai/v1`）、`API Key` 填 OrcaRouter key。

### 验证

- `go build ./internal/ai/...`（Go 1.26）全绿
- `go vet ./internal/ai/protocol/...` 全绿
- `ParseModel("orcarouter/orcarouter/auto")` → `protocol=orcarouter, model=orcarouter/auto`（解析正确）
- L3 live 测：POST `https://api.orcarouter.ai/v1/chat/completions`，model `orcarouter/auto`（与 `OrcaRouter.NewChatModel` 同款请求）→ **HTTP 200**，正常返回内容

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

Type	Assign personnel	Status
Reviewer	Coder慌	In progress (0/1 )
Tester	Coder慌	In progress (0/1 )

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