update backend dependencies

[adamrefaey]

• chore: update dependencies and refactor perplexity module
• Updated AWS SDK and NestJS dependencies to their latest versions.
• Removed PerplexityController and related DTOs as they are no longer needed.
• Adjusted AppModule to remove references to the deleted PerplexityController.
• Updated route handling in AppModule for better clarity.

[Copilot]

Pull Request Overview

This PR updates backend dependencies, refactors the perplexity module, and adjusts route handling in the AppModule. Key changes include:

• Updating the AWS SDK and NestJS dependencies and refactoring vitest.config.ts to use asynchronous configuration.
• Removing the PerplexityController and related DTOs, while leaving the PerplexityService intact.
• Changing the route wildcard in AppModule from '*' to '*path' for improved clarity.

Reviewed Changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
backend/vitest.config.ts	Refactored configuration to support async import of tsconfigPaths.
backend/src/controllers/perplexity/*.ts	Removed unused controller and DTO files.
backend/src/app.module.ts	Removed PerplexityController and updated the wildcard route pattern.
backend/eslint.config.js	Introduced a new ESLint configuration.
backend/.eslintrc.js	Removed in favor of the new ESLint configuration.

Files not reviewed (2)

• backend/.eslintignore: Language not supported
• backend/package.json: Language not supported

Comments suppressed due to low confidence (2)

backend/.eslintrc.js:1

• Confirm that the removal of .eslintrc.js in favor of eslint.config.js fully captures all necessary ESLint rules and overrides to maintain consistent linting.

module.exports = { ... }

backend/src/app.module.ts:35

• Ensure that the new wildcard pattern 'path' matches all intended routes, as it may behave differently compared to the previous '' pattern.

.forRoutes('*path');