feat(assistant): add multi-dialog UX, task-aware llm settings, and i18n cleanup

backend/src/core/config_models.py

@@ -9,7 +9,11 @@
 from pydantic import BaseModel, Field
 from typing import List, Optional
 from ..models.storage import StorageConfig
-from ..services.llm_prompt_templates import DEFAULT_LLM_PROMPTS
+from ..services.llm_prompt_templates import (
+    DEFAULT_LLM_ASSISTANT_SETTINGS,
+    DEFAULT_LLM_PROMPTS,
+    DEFAULT_LLM_PROVIDER_BINDINGS,
+)
 
 # [DEF:Schedule:DataClass]
 # @PURPOSE: Represents a backup schedule configuration.
@@ -55,6 +59,8 @@ class GlobalSettings(BaseModel):
             "providers": [],
             "default_provider": "",
             "prompts": dict(DEFAULT_LLM_PROMPTS),
+            "provider_bindings": dict(DEFAULT_LLM_PROVIDER_BINDINGS),
+            **dict(DEFAULT_LLM_ASSISTANT_SETTINGS),
         }
     )