fix: repair stream end

Author: KernelDeimos

src/backend/src/modules/puterai/ClaudeService.js

@@ -189,6 +189,7 @@ class ClaudeService extends BaseService {
                                 }
                             }
                         }
+                        chatStream.end();
                         usage_promise.resolve(counts);
                     };
 

src/backend/src/modules/puterai/OpenAICompletionService.js

@@ -365,6 +365,7 @@ class OpenAICompletionService extends BaseService {
                 if ( mode === 'text' ) textblock.end();
                 if ( mode === 'tool' ) toolblock.end();
                 message.end();
+                chatStream.end();
             };
 
             return new TypedValue({ $: 'ai-chat-intermediate' }, {

src/backend/src/modules/puterai/lib/Streaming.js

@@ -74,6 +74,10 @@ class AIChatStream {
         this.stream = stream;
     }
 
+    end () {
+        this.stream.end();
+    }
+
     message () {
         return new AIChatMessageStream(this);
     }