feat: Add OpenAI-compatible provider nodes

- Support multiple OpenAI-compatible providers with custom prefix/baseUrl
- Add provider nodes CRUD (create/read/update/delete)
- URL building: baseUrl + /chat/completions or /responses
- Model import from /models endpoint
- API key validation via /models
- Usage type safety across all translators
- OAuth token auto-refresh for expired tokens

src/app/api/translator/send/route.js

@@ -31,7 +31,10 @@ export async function POST(request) {
     };
 
     // Build URL and headers using provider service
-    const url = buildProviderUrl(provider, body.model || "test-model", true, { baseUrlIndex: 0 });
+    const url = buildProviderUrl(provider, body.model || "test-model", true, {
+      baseUrlIndex: 0,
+      baseUrl: connection.providerSpecificData?.baseUrl
+    });
     console.log("🚀 ~ POST ~ url:", url)
     const headers = buildProviderHeaders(provider, credentials, true, body);
     console.log("🚀 ~ POST ~ headers:", headers)

src/app/api/translator/translate/route.js

@@ -91,7 +91,10 @@ export async function POST(request) {
         };
 
         // Build URL and headers
-        const url = buildProviderUrl(provider, model, true, { baseUrlIndex: 0 });
+        const url = buildProviderUrl(provider, model, true, {
+          baseUrlIndex: 0,
+          baseUrl: connection.providerSpecificData?.baseUrl
+        });
         const headers = buildProviderHeaders(provider, credentials, true, actualBody);
         
         result = {