refactor: Move utility services to a dedicated 'services' module

- Updated import paths for LLM, connector, query, and streaming services to reflect their new location in the 'services' module.
- Removed obsolete utility service files that have been migrated.

surfsense_backend/app/services/streaming_service.py

@@ -0,0 +1,72 @@
+import json
+from typing import Any, Dict, List
+
+
+class StreamingService:
+    def __init__(self):
+        self.terminal_idx = 1
+        self.message_annotations = [
+            {
+                "type": "TERMINAL_INFO",
+                "content": []
+            },
+            {
+                "type": "SOURCES",
+                "content": []
+            },
+            {
+                "type": "ANSWER",
+                "content": []
+            }
+        ]
+    # It is used to send annotations to the frontend
+    def _format_annotations(self) -> str:
+        """
+        Format the annotations as a string
+        
+        Returns:
+            str: The formatted annotations string
+        """
+        return f'8:{json.dumps(self.message_annotations)}\n'
+    
+    # It is used to end Streaming
+    def format_completion(self, prompt_tokens: int = 156, completion_tokens: int = 204) -> str:
+        """
+        Format a completion message
+        
+        Args:
+            prompt_tokens: Number of prompt tokens
+            completion_tokens: Number of completion tokens
+            
+        Returns:
+            str: The formatted completion string
+        """
+        total_tokens = prompt_tokens + completion_tokens
+        completion_data = {
+            "finishReason": "stop",
+            "usage": {
+                "promptTokens": prompt_tokens,
+                "completionTokens": completion_tokens,
+                "totalTokens": total_tokens
+            }
+        }
+        return f'd:{json.dumps(completion_data)}\n' 
+    
+    def only_update_terminal(self, text: str, message_type: str = "info") -> str:
+        self.message_annotations[0]["content"].append({
+            "id": self.terminal_idx,
+            "text": text,
+            "type": message_type
+        })
+        self.terminal_idx += 1
+        return self.message_annotations
+
+    def only_update_sources(self, sources: List[Dict[str, Any]]) -> str:
+        self.message_annotations[1]["content"] = sources
+        return self.message_annotations
+    
+    def only_update_answer(self, answer: List[str]) -> str:
+        self.message_annotations[2]["content"] = answer
+        return self.message_annotations
+    
+