docs: add AIHubMix provider documentation in English and Chinese

Author: Soulter

.vitepress/config.mjs

@@ -127,6 +127,7 @@ export default defineConfig({
                 items: [
                   { text: "✨ 接入模型服务", link: "/start" },
                   { text: "NewAPI", link: "/newapi" },
+                  { text: "AIHubMix", link: "/aihubmix" },
                   { text: "PPIO 派欧云", link: "/ppio" },
                   { text: "硅基流动", link: "/siliconflow" },
                   { text: "小马算力", link: "/tokenpony" },
@@ -349,6 +350,7 @@ export default defineConfig({
                 items: [
                   { text: "✨ Connecting LLM Services", link: "/start" },
                   { text: "NewAPI", link: "/newapi" },
+                  { text: "AIHubMix", link: "/aihubmix" },
                   { text: "PPIO Cloud", link: "/ppio" },
                   { text: "SiliconFlow", link: "/siliconflow" },
                   { text: "TokenPony", link: "/tokenpony" },

en/config/providers/aihubmix.md

@@ -0,0 +1,13 @@
+# AIHubMix
+
+AIHubMix provides a variety of models and convenient access methods, similar to OpenRouter. It offers ample daily free model calls, such as `gemini-3-flash-preview-free`, `gpt-4o-free`, `kimi-for-coding-free`, etc., making it suitable for individual developers and small project testing.
+
+## Usage
+
+Click [this link](https://aihubmix.com/?aff=4bfH) to register an account.
+
+After registration, click [this link](https://aihubmix.com/models) to select the model you want to access.
+
+## Integration
+
+Open AstrBot WebUI -> Service Providers page, click "Add Provider", find and click `AIHubMix`, configure the API Key, select the model you want to access, and click "Save" to complete the setup.

zh/config/providers/aihubmix.md

@@ -0,0 +1,13 @@
+# 接入 AIHubMix
+
+AIHuMix 是类似 OpenRouter 的第三方模型服务提供商，提供了丰富的模型选择和便捷的接入方式。并且提供充足的每日免费模型调用次数，如 `gemini-3-flash-preview-free`, `gpt-4o-free`, `kimi-for-coding-free` 等，适合个人开发者和小型项目测试使用。
+
+## 使用
+
+点击[此链接](https://aihubmix.com/?aff=4bfH) 注册账户。
+
+注册完毕之后，点击[此链接](https://aihubmix.com/models)选择需要接入的模型。
+
+## 接入
+
+打开 AstrBot WebUI -> 服务提供商页面，点击新增提供商，找到并点击 `AIHubMix`，配置 API Key 后，选择需要接入的模型，点击保存，即可完成创建。