feat: uploader support config multiple by file/image/video

[kagol]

PR

close #439

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: #439

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

Summary by CodeRabbit

Release Notes

• New Features
  • Enhanced file upload configuration with multi-select control. Upload components now support per-type settings to enable or disable multiple file selection for images, videos, and documents, providing greater flexibility in file upload workflows.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The changes introduce granular per-type multiple file selection configuration to the uploader. A new MultipleConfig type enables setting multiple as either a global boolean or per-UploadKind override, with a resolver method and demo configuration example showing the new capability.

Changes

Cohort / File(s)	Summary
Core Implementation packages/fluent-editor/src/modules/custom-uploader.ts	Introduces MultipleConfig type for global or per-UploadKind boolean configuration. Adds multiple option to FileUploaderOptions with resolver logic in resolveOptions. Implements public getMultiple(kind: UploadKind): boolean method to retrieve effective multi-select behavior.
Configuration and Integration packages/fluent-editor/src/config/index.ts	Modifies inputFile to conditionally apply multiple attribute by calling this.quill.uploader.getMultiple(type) instead of always setting it.
Demo Configuration packages/docs/fluent-editor/demos/file-upload.vue	Adds multiple configuration block under uploader settings with per-type flags: file: false, image: true, video: false.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A fluffy feature hops into view,
Per-type control—now files pick too!
Global or granular, the choice is yours,
The uploader dances through new doors! ✨

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch kagol/uploader-support-multiple

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