refactor: Speed up Config fetching and Setup Config Groundwork 👷🚧 (#1297)

* refactor: move endpoint services to own directory

* refactor: make endpointconfig handling more concise, separate logic, and cache result for subsequent serving

* refactor: ModelController gets same treatment as EndpointController, draft OverrideController

* wip: flesh out override controller more to return real value

* refactor: client/api changes in anticipation of override

client/src/hooks/Config/index.ts

@@ -0,0 +1 @@
+export { default as useConfigOverride } from './useConfigOverride';

client/src/hooks/Config/useConfigOverride.ts

@@ -0,0 +1,47 @@
+import { useSetRecoilState } from 'recoil';
+import { useEffect, useCallback } from 'react';
+import { useQueryClient } from '@tanstack/react-query';
+import type { TEndpointsConfig, TModelsConfig } from 'librechat-data-provider';
+import { useGetEndpointsConfigOverride } from '~/data-provider';
+import { QueryKeys } from 'librechat-data-provider';
+import store from '~/store';
+
+type TempOverrideType = Record<string, unknown> & {
+  endpointsConfig: TEndpointsConfig;
+  modelsConfig: TModelsConfig;
+  combinedOptions: unknown[];
+  combined: boolean;
+};
+
+export default function useConfigOverride() {
+  const setModelsConfig = useSetRecoilState(store.modelsConfig);
+  const setEndpointsQueryEnabled = useSetRecoilState(store.endpointsQueryEnabled);
+  const overrideQuery = useGetEndpointsConfigOverride({
+    staleTime: Infinity,
+  });
+
+  const queryClient = useQueryClient();
+
+  const handleOverride = useCallback(
+    async (data: unknown | boolean) => {
+      const { endpointsConfig, modelsConfig } = data as TempOverrideType;
+      if (endpointsConfig) {
+        setEndpointsQueryEnabled(false);
+        await queryClient.cancelQueries([QueryKeys.endpoints]);
+        queryClient.setQueryData([QueryKeys.endpoints], endpointsConfig);
+      }
+      if (modelsConfig) {
+        await queryClient.cancelQueries([QueryKeys.models]);
+        queryClient.setQueryData([QueryKeys.models], modelsConfig);
+        setModelsConfig(modelsConfig);
+      }
+    },
+    [queryClient, setEndpointsQueryEnabled, setModelsConfig],
+  );
+
+  useEffect(() => {
+    if (overrideQuery.data) {
+      handleOverride(overrideQuery.data);
+    }
+  }, [overrideQuery.data, handleOverride]);
+}

client/src/hooks/index.ts

@@ -1,4 +1,5 @@
 export * from './Messages';
+export * from './Config';
 export * from './Input';
 export * from './Conversations';