🧹 chore: Remove Unused Cache Configuration Keys (#9551)

* Remove unused STATIC_CONFIG and LIBRECHAT_YAML_CONFIG cache keys.

These cache keys were identified as dead code - they were being written to but never read from anywhere in the codebase after a recent refactor:

- STATIC_CONFIG was used as a cache namespace that stored configuration data
- LIBRECHAT_YAML_CONFIG was the key used within that namespace to store parsed YAML config
- The cache.set() operation in loadCustomConfig.js stored the config but no cache.get() operations retrieved it
- Configuration data is already handled through other mechanisms without caching

* # removed tests regarding cache

api/server/services/Config/loadCustomConfig.js

@@ -119,10 +119,6 @@ https://www.librechat.ai/docs/configuration/stt_tts`);
     .filter((endpoint) => endpoint.customParams)
     .forEach((endpoint) => parseCustomParams(endpoint.name, endpoint.customParams));
 
-  if (customConfig.cache) {
-    const cache = getLogStores(CacheKeys.STATIC_CONFIG);
-    await cache.set(CacheKeys.LIBRECHAT_YAML_CONFIG, customConfig);
-  }
 
   if (result.data.modelSpecs) {
     customConfig.modelSpecs = result.data.modelSpecs;

api/server/services/Config/loadCustomConfig.spec.js

@@ -48,16 +48,11 @@ const axios = require('axios');
 const { loadYaml } = require('@librechat/api');
 const { logger } = require('@librechat/data-schemas');
 const loadCustomConfig = require('./loadCustomConfig');
-const getLogStores = require('~/cache/getLogStores');
 
 describe('loadCustomConfig', () => {
-  const mockSet = jest.fn();
-  const mockCache = { set: mockSet };
-
   beforeEach(() => {
     jest.resetAllMocks();
     delete process.env.CONFIG_PATH;
-    getLogStores.mockReturnValue(mockCache);
   });
 
   it('should return null and log error if remote config fetch fails', async () => {
@@ -94,7 +89,6 @@ describe('loadCustomConfig', () => {
     const result = await loadCustomConfig();
 
     expect(result).toEqual(mockConfig);
-    expect(mockSet).toHaveBeenCalledWith(expect.anything(), mockConfig);
   });
 
   it('should return null and log if config schema validation fails', async () => {
@@ -134,7 +128,6 @@ describe('loadCustomConfig', () => {
     axios.get.mockResolvedValue({ data: mockConfig });
     const result = await loadCustomConfig();
     expect(result).toEqual(mockConfig);
-    expect(mockSet).toHaveBeenCalledWith(expect.anything(), mockConfig);
   });
 
   it('should return null if the remote config file is not found', async () => {
@@ -168,7 +161,6 @@ describe('loadCustomConfig', () => {
     process.env.CONFIG_PATH = 'validConfig.yaml';
     loadYaml.mockReturnValueOnce(mockConfig);
     await loadCustomConfig();
-    expect(mockSet).not.toHaveBeenCalled();
   });
 
   it('should log the loaded custom config', async () => {