Add Unity AI Assistant package & settings

Add the com.unity.ai.assistant (2.13.0-pre.1) package to Packages/manifest.json and include related package lock updates. Add default ProjectSettings/Packages/com.unity.ai.assistant/Settings.json to store assistant configuration. Update ProjectSettings.asset to populate cloudServicesEnabled defaults and set project metadata (cloudProjectId, projectName: BABA_YAGA, organizationId: scov3).

ProjectSettings/ProjectSettings.asset

@@ -869,7 +869,13 @@ PlayerSettings:
   XboxOneOverrideIdentityName: 
   XboxOneOverrideIdentityPublisher: 
   vrEditorSettings: {}
-  cloudServicesEnabled: {}
+  cloudServicesEnabled:
+    Build: 0
+    Game Performance: 0
+    Legacy Analytics: 0
+    Purchasing: 0
+    UDP: 0
+    Unity Ads: 0
   luminIcon:
     m_Name: 
     m_ModelFolderPath: 
@@ -891,11 +897,11 @@ PlayerSettings:
   captureStartupLogs: {}
   activeInputHandler: 2
   windowsGamepadBackendHint: 0
-  cloudProjectId: 
+  cloudProjectId: 7d3e96b5-06b3-4407-80e7-290c1ef31670
   framebufferDepthMemorylessMode: 0
   qualitySettingsNames: []
-  projectName: 
-  organizationId: 
+  projectName: BABA_YAGA
+  organizationId: scov3
   cloudEnabled: 0
   legacyClampBlendShapeWeights: 0
   hmiLoadingImage: {fileID: 0}