Refactor backend to use common package structure

Moved configuration, authentication, models, services, and utility modules from src/backend to src/backend/common for better organization and modularity. Updated all imports throughout the backend to reflect the new structure. Removed obsolete files including app_config.py, config_kernel.py, and several validation and test modules that are now redundant or replaced by the new structure.

Author: Fr4nc3

src/backend/app_kernel.py

@@ -10,12 +10,11 @@
 from typing import Dict, List, Optional
 
 # Semantic Kernel imports
-from app_config import config
+from common.config.app_config import config
 from auth.auth_utils import get_authenticated_user_details
 from azure.monitor.opentelemetry import configure_azure_monitor
-from config_kernel import Config
 from dateutil import parser
-from event_utils import track_event_if_configured
+from common.utils.event_utils import track_event_if_configured
 
 # FastAPI imports
 from fastapi import FastAPI, HTTPException, Query, Request, UploadFile, File
@@ -24,7 +23,7 @@
 
 # Local imports
 from middleware.health_check import HealthCheckMiddleware
-from models.messages_kernel import (
+from common.models.messages_kernel import (
     AgentMessage,
     AgentType,
     GeneratePlanRequest,
@@ -38,11 +37,11 @@
     UserLanguage,
     TeamConfiguration,
 )
-from services.json_service import JsonService
+from common.services.json_service import JsonService
 
 
 # Updated import for KernelArguments
-from utils_kernel import (
+from common.utils.utils_kernel import (
     initialize_runtime_and_context,
     rai_success,
     rai_validate_team_config,
@@ -81,7 +80,7 @@
 # Initialize the FastAPI app
 app = FastAPI()
 
-frontend_url = Config.FRONTEND_SITE_NAME
+frontend_url = config.FRONTEND_SITE_NAME
 
 # Add this near the top of your app.py, after initializing the app
 app.add_middleware(

src/backend/services/__init__.py src/backend/common/auth/__init__.pysrc/backend/services/__init__.py renamed to src/backend/common/auth/__init__.py

@@ -0,0 +1 @@
+# Services package

…ackend/helpers/azure_credential_utils.py …nd/common/auth/azure_credential_utils.pysrc/backend/helpers/azure_credential_utils.py renamed to src/backend/common/auth/azure_credential_utils.py src/backend/helpers/azure_credential_utils.py renamed to src/backend/common/auth/azure_credential_utils.py

@@ -5,7 +5,7 @@
 
 from azure.ai.projects.aio import AIProjectClient
 from azure.cosmos.aio import CosmosClient
-from helpers.azure_credential_utils import get_azure_credential
+from common.auth.azure_credential_utils import get_azure_credential
 from dotenv import load_dotenv
 from semantic_kernel.kernel import Kernel
 
@@ -159,7 +159,9 @@ def get_ai_project_client(self):
                 )
 
             endpoint = self.AZURE_AI_AGENT_ENDPOINT
-            self._ai_project_client = AIProjectClient(endpoint=endpoint, credential=credential)
+            self._ai_project_client = AIProjectClient(
+                endpoint=endpoint, credential=credential
+            )
 
             return self._ai_project_client
         except Exception as exc:

src/backend/common/config/__init__.py

@@ -15,9 +15,13 @@
 from azure.identity import DefaultAzureCredential
 from azure.search.documents.indexes import SearchIndexClient
 
-from models.messages_kernel import TeamConfiguration, TeamAgent, StartingTask
+from common.models.messages_kernel import (
+    TeamConfiguration,
+    TeamAgent,
+    StartingTask,
+)
 from context.cosmos_memory_kernel import CosmosMemoryContext
-from helpers.azure_credential_utils import get_azure_credential
+from common.auth.azure_credential_utils import get_azure_credential
 
 
 class JsonService: