feat: add AIHubMix provider (#865)

* feat: add AIHubMix provider

* feat: load AIHubMix models dynamically

* feat: polish AIHubMix model setup

* feat: send AIHubMix app code

* docs: remove redundant AIHubMix recommendation

---------

Co-authored-by: LL <13697272357@163.com>

app/api/validate-model/route.ts

@@ -5,11 +5,16 @@ import { createGateway } from "@ai-sdk/gateway"
 import { createGoogleGenerativeAI } from "@ai-sdk/google"
 import { createVertex } from "@ai-sdk/google-vertex"
 import { createOpenAI } from "@ai-sdk/openai"
+import { createAihubmix } from "@aihubmix/ai-sdk-provider"
 import { createOpenRouter } from "@openrouter/ai-sdk-provider"
 import { generateText } from "ai"
 import { NextResponse } from "next/server"
 import { createOllama } from "ollama-ai-provider-v2"
-import { normalizeMiniMaxBaseURL } from "@/lib/ai-providers"
+import {
+    AIHUBMIX_APP_CODE,
+    isAihubmixStandardBaseURL,
+    normalizeMiniMaxBaseURL,
+} from "@/lib/ai-providers"
 import { allowPrivateUrls, isPrivateUrl } from "@/lib/ssrf-protection"
 import { PROVIDER_INFO, type ProviderName } from "@/lib/types/model-config"
 
@@ -153,6 +158,28 @@ export async function POST(req: Request) {
                 break
             }
 
+            case "aihubmix": {
+                const defaultBaseURL = PROVIDER_INFO.aihubmix.defaultBaseUrl
+
+                if (
+                    isAihubmixStandardBaseURL(baseUrl) ||
+                    baseUrl === defaultBaseURL
+                ) {
+                    const aihubmix = createAihubmix({
+                        apiKey,
+                        appCode: AIHUBMIX_APP_CODE,
+                    })
+                    model = aihubmix(modelId)
+                } else {
+                    const aihubmixCompatible = createOpenAI({
+                        apiKey,
+                        baseURL: baseUrl,
+                    })
+                    model = aihubmixCompatible.chat(modelId)
+                }
+                break
+            }
+
             case "deepseek": {
                 if (baseUrl || apiKey) {
                     const ds = createDeepSeek({