* chore: correct type for ServerRequest
* chore: improve ServerRequest typing across several modules
* feat: Add PDF configured limit validation
- Introduced comprehensive tests for PDF validation across multiple providers, ensuring correct behavior for file size limits and edge cases.
- Enhanced the `validatePdf` function to accept an optional configured file size limit, allowing for stricter validation based on user configurations.
- Updated related functions to utilize the new validation logic, ensuring consistent behavior across different providers.
* chore: Update Request type to ServerRequest in audio and video encoding modules
* refactor: move `getConfiguredFileSizeLimit` utility
* feat: Add video and audio validation with configurable size limits
- Introduced `validateVideo` and `validateAudio` functions to validate media files against provider-specific size limits.
- Enhanced validation logic to consider optional configured file size limits, allowing for more flexible file handling.
- Added comprehensive tests for video and audio validation across different providers, ensuring correct behavior for various scenarios.
* refactor: Update PDF and media validation to allow higher configured limits
- Modified validation logic to accept user-configured file size limits that exceed provider defaults, ensuring correct acceptance of files within the specified range.
- Updated tests to reflect changes in validation behavior, confirming that files are accepted when within the configured limits.
- Enhanced documentation in tests to clarify expected outcomes with the new validation rules.
* chore: Add @types/node-fetch dependency to package.json and package-lock.json
- Included the @types/node-fetch package to enhance type definitions for node-fetch usage.
- Updated package-lock.json to reflect the addition of the new dependency.
* fix: Rename FileConfigInput to TFileConfig
- problem: `addImageUrls` had a side effect that was being leveraged before to populate both the `ocr` message field, now `fileContext`, and `client.options.attachments`, which would record the user's uploaded message attachments to the user message when saved to the database and returned at the end of the request lifecycle
- solution: created dedicated handling for file context, and made sure to populate `allFiles` with non-provider attachments
