Fix backend imports for Docker (core -> backend.core)

backend/api/conversation_service.py

@@ -33,8 +33,8 @@ for path in (BACKEND_DIR, PROJECT_ROOT):
         sys.path.insert(0, str(path))
 
 from config.settings import AppSettings, get_settings  # noqa: E402
-from core.conversation_manager import ConversationManager  # noqa: E402
-from core.persona_system import PersonaSystem  # noqa: E402
+from backend.core.conversation_manager import ConversationManager  # noqa: E402
+from backend.core.persona_system import PersonaSystem  # noqa: E402
 from .conversation_ws import ConnectionManager  # noqa: E402
 
 # Setup logging

backend/api/routes.py

@@ -24,7 +24,7 @@ from pydantic import BaseModel, Field
 from typing import Dict, List, Optional
 import logging
 from .conversation_service import get_conversation_service
-from core.persona_system import PersonaSystem
+from backend.core.persona_system import PersonaSystem
 
 # Setup logging
 logger = logging.getLogger(__name__)

backend/core/conversation_manager.py

@@ -29,8 +29,8 @@ from pathlib import Path
 # Add backend to path for imports
 sys.path.insert(0, str(Path(__file__).parent.parent))
 
-from core.llm_client import create_llm_client
-from core.persona_system import PersonaSystem
+from backend.core.llm_client import create_llm_client
+from backend.core.persona_system import PersonaSystem
 
 
 class ConversationState(Enum):