Reorder and remove unused imports

Reorders the llm_registry import in backend/blocks/llm.py to group data imports together and updates import ordering. Removes unused imports (update_schema_with_llm_registry, NodeExecutionStats, ProviderName) from backend/data/block.py to clean up dead imports and simplify the module surface.

autogpt_platform/backend/backend/blocks/llm.py

@@ -16,7 +16,6 @@ from groq import AsyncGroq
 from pydantic import BaseModel, GetCoreSchemaHandler, SecretStr
 from pydantic_core import CoreSchema, core_schema
 
-from backend.data import llm_registry
 from backend.blocks._base import (
     Block,
     BlockCategory,
@@ -24,6 +23,7 @@ from backend.blocks._base import (
     BlockSchemaInput,
     BlockSchemaOutput,
 )
+from backend.data import llm_registry
 from backend.data.llm_registry import ModelMetadata
 from backend.data.model import (
     APIKeyCredentials,

autogpt_platform/backend/backend/data/block.py

@@ -4,9 +4,6 @@ from typing import TYPE_CHECKING, Any, AsyncGenerator
 from prisma.models import AgentBlock
 from prisma.types import AgentBlockCreateInput
 
-from backend.data.llm_registry import update_schema_with_llm_registry
-from backend.data.model import NodeExecutionStats
-from backend.integrations.providers import ProviderName
 from backend.util import json
 
 if TYPE_CHECKING: