Update OpenAI chat model to gpt-4.1-mini

Author: brusacco

app/models/entry.rb

@@ -328,7 +328,7 @@ def call_ai(text)
     client = OpenAI::Client.new(access_token: Rails.application.credentials.openai_access_token)
     response = client.chat(
       parameters: {
-        model: 'gpt-3.5-turbo', # Required.
+        model: 'gpt-4.1-mini', # Required.
         messages: [{ role: 'user', content: text }], # Required.
         temperature: 0.7
       }

app/services/ai_services/open_ai_query.rb

@@ -12,7 +12,7 @@ def call
       loop do
         response = client.chat(
           parameters: {
-            model: 'gpt-3.5-turbo',
+            model: 'gpt-4.1-mini',
             messages: [{ role: 'user', content: @text }],
             temperature: 0.7
           }

docs/SYSTEM_ARCHITECTURE.md

@@ -279,7 +279,7 @@ GET /2/users/{user_id}
 
 **Endpoint**: `https://api.openai.com/v1`  
 **Authentication**: Bearer token (API key)  
-**Model**: `gpt-3.5-turbo`  
+**Model**: `gpt-4.1-mini`  
 **Cost**: ~$0.002 per 1K tokens
 
 #### **Use Cases**:

lib/tasks/telegram_bot.rake

@@ -33,7 +33,7 @@ task telegram_bot: :environment do
 
     response = client.chat(
       parameters: {
-        model: 'gpt-3.5-turbo', # Required.
+        model: 'gpt-4.1-mini', # Required.
         messages: [{ role: 'user', content: prompt }], # Required.
         temperature: 0.7
       }

lib/tasks/util.rake

@@ -31,7 +31,7 @@ task test_openai: :environment do
 
   response = client.chat(
     parameters: {
-      model: 'gpt-3.5-turbo', # Required.
+      model: 'gpt-4.1-mini', # Required.
       messages: [{ role: 'user', content: entries.prompt(topic.name) }], # Required.
       temperature: 0.7
     }