refactor(wizard): add uploaded task api

[ycdzj]

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[Copilot]

Pull Request Overview

This PR adds an API for uploading task results via S3 presigned URLs. Instead of tasks being posted directly to the callback endpoint, workers can now request an upload URL, upload the task result to S3, and then trigger a callback that retrieves and processes the uploaded data.

• Adds two new endpoints: one to generate upload URLs and another to handle callbacks for uploaded tasks
• Introduces uploadedTaskDoneCallback method to retrieve and parse task results from S3
• Modifies task callback DTO fields to use optional syntax and handle null values explicitly

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
src/wizard/wizard.service.ts	Adds createTaskUploadUrl and uploadedTaskDoneCallback methods to support S3-based task uploads, and updates task callback handling to explicitly set null for optional fields
src/wizard/internal.wizard.controller.ts	Adds two new endpoints for generating upload URLs and processing uploaded task callbacks (with a bug in the callback endpoint implementation)
src/wizard/dto/task-callback.dto.ts	Updates exception and output fields to use TypeScript optional syntax for clearer type definitions
src/s3/s3.service.ts	Adds generateUploadUrl method to create presigned URLs for uploading objects to S3

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