fix: correct AI model name to gpt-4o-mini and improve rate limit handling

Author: Connor200024

ai.config.js

@@ -6,7 +6,7 @@ const __dirname = dirname(__filename)
 
 export const aiConfig = {
     // Model configuration
-    model: 'gpt-4.1-nano',
+    model: 'gpt-4o-mini',
     temperature: 0.7,
     maxTokens: 1500,
 

src/configs/ai.config.js

@@ -1,6 +1,6 @@
 export const aiConfig = {
     // Model configuration
-    model: 'gpt-4.1-nano',
+    model: 'gpt-4o-mini',
     temperature: 0.7,
     maxTokens: 1500,
 

src/echo-ai/aiModel.js

@@ -86,6 +86,12 @@ export class AIModel {
             return result.text
         } catch (error) {
             console.error('AI Model Error:', error)
+            
+            // Check if it's a rate limit error
+            if (error.message?.includes('Rate limit') || error.statusCode === 429) {
+                throw new Error('Rate limit exceeded. Please try again in a moment.')
+            }
+            
             throw new Error(`AI model request failed: ${error.message}`)
         }
     }