feat(llm-config): complete migration of useGlobalLLMConfigs to globalLLMConfigsAtom

- Removed unused import from model-config-manager.tsx
- Deleted useGlobalLLMConfigs hook (no longer used anywhere)
- All 5 components now using jotai + tanstack query pattern
- Full backward compatibility maintained

surfsense_web/components/settings/model-config-manager.tsx

@@ -59,9 +59,6 @@ import {
 import { LANGUAGES } from "@/contracts/enums/languages";
 import { getModelsByProvider } from "@/contracts/enums/llm-models";
 import { LLM_PROVIDERS } from "@/contracts/enums/llm-providers";
-import {
-	useGlobalLLMConfigs,
-} from "@/hooks/use-llm-configs";
 import { cn } from "@/lib/utils";
 import InferenceParamsEditor from "../inference-params-editor";
 import { useAtomValue } from "jotai";