🧭 fix: Add Base Path Support for Login/Register and Image Paths (#10116)

* fix: add basePath pattern to support login/register and image paths

* Fix linter errors

* refactor: Update import statements for getBasePath and isEnabled, and add path utility functions with tests

- Refactored imports in addImages.js and StableDiffusion.js to use getBasePath from '@librechat/api'.
- Consolidated isEnabled and getBasePath imports in validateImageRequest.js.
- Introduced new path utility functions in path.ts and corresponding unit tests in path.spec.ts to validate base path extraction logic.

* fix: Update domain server base URL in MarkdownComponents and refactor authentication redirection logic

- Changed the domain server base URL in MarkdownComponents.tsx to use the API base URL.
- Refactored the useAuthRedirect hook to utilize React Router's navigate for redirection instead of window.location, ensuring a smoother SPA experience.
- Added unit tests for the useAuthRedirect hook to verify authentication redirection behavior.

* test: Mock isEnabled in validateImages.spec.js for improved test isolation

- Updated validateImages.spec.js to mock the isEnabled function from @librechat/api, ensuring that tests can run independently of the actual implementation.
- Cleared the DOMAIN_CLIENT environment variable before tests to avoid interference with basePath resolution.

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Co-authored-by: Danny Avila <danny@librechat.ai>

api/server/services/Files/Code/process.js

@@ -15,6 +15,7 @@ const { filterFilesByAgentAccess } = require('~/server/services/Files/permission
 const { getStrategyFunctions } = require('~/server/services/Files/strategies');
 const { convertImage } = require('~/server/services/Files/images/convert');
 const { createFile, getFiles, updateFile } = require('~/models/File');
+const { getBasePath } = require('~/server/utils');
 
 /**
  * Process OpenAI image files, convert to target format, save and return file metadata.
@@ -41,11 +42,12 @@ const processCodeOutput = async ({
   const appConfig = req.config;
   const currentDate = new Date();
   const baseURL = getCodeBaseURL();
+  const basePath = getBasePath();
   const fileExt = path.extname(name);
   if (!fileExt || !imageExtRegex.test(name)) {
     return {
       filename: name,
-      filepath: `/api/files/code/download/${session_id}/${id}`,
+      filepath: `${basePath}/api/files/code/download/${session_id}/${id}`,
       /** Note: expires 24 hours after creation */
       expiresAt: currentDate.getTime() + 86400000,
       conversationId,