fix: persist Azure providerSpecificData and add connection test

- Read body.providerSpecificData in POST /api/providers so Azure fields
  (endpoint, deployment, apiVersion, organization) are actually stored
- Add azure case to testApiKeyConnection so the Test button works
  correctly instead of falling through to "not supported"

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/api/providers/[id]/test/testUtils.js

@@ -365,6 +365,21 @@ async function testApiKeyConnection(connection, effectiveProxy = null) {
 
   try {
     switch (connection.provider) {
+      case "azure": {
+        const psd = connection.providerSpecificData || {};
+        const endpoint = (psd.azureEndpoint || "").replace(/\/$/, "");
+        const deployment = psd.deployment || "gpt-4";
+        const apiVersion = psd.apiVersion || "2024-10-01-preview";
+        const url = `${endpoint}/openai/deployments/${deployment}/chat/completions?api-version=${apiVersion}`;
+        const headers = { "api-key": connection.apiKey, "Content-Type": "application/json" };
+        if (psd.organization) headers["OpenAI-Organization"] = psd.organization;
+        const res = await fetchWithConnectionProxy(url, {
+          method: "POST", headers,
+          body: JSON.stringify({ messages: [{ role: "user", content: "test" }], max_completion_tokens: 1 }),
+        }, effectiveProxy);
+        const valid = res.status !== 401 && res.status !== 403;
+        return { valid, error: valid ? null : "Invalid API key or Azure configuration" };
+      }
       case "openai": {
         const res = await fetchWithConnectionProxy("https://api.openai.com/v1/models", { headers: { Authorization: `Bearer ${connection.apiKey}` } }, effectiveProxy);
         return { valid: res.ok, error: res.ok ? null : "Invalid API key" };

src/app/api/providers/route.js

@@ -114,7 +114,7 @@ export async function POST(request) {
       return NextResponse.json({ error: "Name is required" }, { status: 400 });
     }
 
-    let providerSpecificData = null;
+    let providerSpecificData = body.providerSpecificData || null;
 
     if (isOpenAICompatibleProvider(provider)) {
       const node = await getProviderNodeById(provider);