Backend is here. Default admin is created if needed.

services/geminiService.ts

@@ -1,14 +1,12 @@
-import { GoogleGenAI, Chat } from "@google/genai";
 import { WorkoutSession } from '../types';
+import { api } from './api';
 
-const MODEL_ID = 'gemini-2.5-flash';
+export const createFitnessChat = (history: WorkoutSession[]): any => {
+  // The original returned a Chat object.
+  // Now we need to return something that behaves like it or refactor the UI.
+  // The UI likely calls `chat.sendMessage(msg)`.
+  // So we return an object with `sendMessage`.
 
-export const createFitnessChat = (history: WorkoutSession[]): Chat | null => {
-  const apiKey = process.env.API_KEY;
-  if (!apiKey) return null;
-
-  const ai = new GoogleGenAI({ apiKey });
-  
   // Summarize data to reduce token count while keeping relevant context
   const summary = history.slice(0, 10).map(s => ({
     date: new Date(s.startTime).toLocaleDateString('ru-RU'),
@@ -29,10 +27,17 @@ export const createFitnessChat = (history: WorkoutSession[]): Chat | null => {
     Отвечай емко, мотивирующе. Избегай длинных лекций, если не просили.
   `;
 
-  return ai.chats.create({
-    model: MODEL_ID,
-    config: {
-      systemInstruction,
-    },
-  });
+  return {
+    sendMessage: async (userMessage: string) => {
+      const res = await api.post('/ai/chat', {
+        systemInstruction,
+        userMessage
+      });
+      return {
+        response: {
+          text: () => res.response
+        }
+      };
+    }
+  };
 };