fix: 修正 logo 中 N 和 G 字母造型

N 添加对角线笔画（█▄ █），G 添加内横杠（█ ▀█），
避免与 O 字母造型雷同。同步更新 ui.ts 中的硬编码 wordmark。

packages/llm/test/provider/openrouter.test.ts

@@ -0,0 +1,56 @@
+import { describe, expect } from "bun:test"
+import { Effect } from "effect"
+import { LLM } from "../../src"
+import { LLMClient } from "../../src/route"
+import * as OpenRouter from "../../src/providers/openrouter"
+import { it } from "../lib/effect"
+
+describe("OpenRouter", () => {
+  it.effect("prepares OpenRouter models through the OpenAI-compatible Chat route", () =>
+    Effect.gen(function* () {
+      const model = OpenRouter.configure({ apiKey: "test-key" }).model("openai/gpt-4o-mini")
+
+      expect(model).toMatchObject({
+        id: "openai/gpt-4o-mini",
+        provider: "openrouter",
+        route: { id: "openrouter" },
+      })
+      expect(model.route.endpoint.baseURL).toBe("https://openrouter.ai/api/v1")
+
+      const prepared = yield* LLMClient.prepare(LLM.request({ model, prompt: "Say hello." }))
+
+      expect(prepared.route).toBe("openrouter")
+      expect(prepared.body).toMatchObject({
+        model: "openai/gpt-4o-mini",
+        messages: [{ role: "user", content: "Say hello." }],
+        stream: true,
+      })
+    }),
+  )
+
+  it.effect("applies OpenRouter payload options from the model helper", () =>
+    Effect.gen(function* () {
+      const prepared = yield* LLMClient.prepare(
+        LLM.request({
+          model: OpenRouter.configure({
+            apiKey: "test-key",
+            providerOptions: {
+              openrouter: {
+                usage: true,
+                reasoning: { effort: "high" },
+                promptCacheKey: "session_123",
+              },
+            },
+          }).model("anthropic/claude-3.7-sonnet:thinking"),
+          prompt: "Think briefly.",
+        }),
+      )
+
+      expect(prepared.body).toMatchObject({
+        usage: { include: true },
+        reasoning: { effort: "high" },
+        prompt_cache_key: "session_123",
+      })
+    }),
+  )
+})