refactor(files): update upload method

[ycdzj]

• refactor(files): add metadata headers
• refactor(files): use PostObject

[Copilot]

Pull Request Overview

This PR adds support for S3 presigned POST form uploads, enabling direct browser-to-S3 file uploads with size validation. The changes introduce a new upload mechanism alongside the existing presigned URL approach.

• Adds AWS SDK S3 client packages for presigned POST generation
• Implements file size validation with configurable limits
• Extends file creation API to return both presigned URL and POST form data

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
package.json	Adds three AWS SDK S3 packages for client, presigned post, and request presigner functionality
pnpm-lock.yaml	Lock file updates for AWS SDK S3 dependencies
src/files/files.service.ts	Implements S3Client initialization, adds generatePostForm method with size validation
src/namespace-resources/namespace-resources.service.ts	Updates createFile to generate and return POST form data
src/namespace-resources/dto/file-info.dto.ts	Adds postUrl and postFields properties to DTO, imports Record type
src/namespace-resources/dto/create-file-req.dto.ts	Adds size field with validation constraints
src/i18n/en/resource.json	Adds "File is too large" error message
src/i18n/zh/resource.json	Adds Chinese translation for file size error

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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