fix: stdClass as array error in ConversationRepository

EspoCRM returns JSON data as stdClass objects, not arrays. Using
array access ($data[$i]['role']) on stdClass causes fatal error.
Fixed by using json_decode(json_encode(...), true) to ensure deep
conversion to associative arrays.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

manifest.json

@@ -3,7 +3,7 @@
     "module": "SmartAssistant",
     "description": "Unified AI Assistant for Legal CRM — floating chat with case memory, office alerts, and n8n integration",
     "author": "klear",
-    "version": "1.1.5",
+    "version": "1.1.6",
     "acceptableVersions": [
         ">=8.0.0"
     ],