(NII-Proposal) add plugin architecture for file actions

[yacchin1205]

This Draft Pull Request is for reference purposes. The details will be discussed in the COS-NII meeting.

• Ticket: []
• Feature flag: n/a

Purpose

Add a plugin architecture for file browser actions (context menu and toolbar). Extensions are included in the codebase but can be enabled/disabled at build time via extensions.config.ts.

Summary of Changes

• Add FileActionExtension interface for menu/toolbar/both targets
• Add ExtensionRegistry service for dynamic extension loading
• Add extensions.config.ts for build-time configuration
• Add "Copy Link" as example extension (in Share submenu)
• Add "OnlyOffice" as example extension (dummy implementation)

See docs/file-extensions.md for usage.

Screenshot(s)

Example: Copy Link

extensions.config.ts:

export const extensionConfig: ExtensionConfig[] = [
  {
    load: () => import('./extensions/copy-links'),
    factory: 'copyLinksExtensionFactory',
    enabled: true,
  },
];

Copy Link (Menu Item):

Example: OnlyOffice Integration (dummy)

extensions.config.ts:

export const extensionConfig: ExtensionConfig[] = [
  // ... other extensions ...

  // Edit by OnlyOffice
  {
    load: () => import('./extensions/onlyoffice'),
    factory: 'editByOnlyOfficeExtensionFactory',
    enabled: true,
    config: { editorUrl: 'https://...' },
  },
  // Create File
  {
    load: () => import('./extensions/onlyoffice'),
    factory: 'createFileExtensionFactory',
    enabled: true,
    config: { editorUrl: 'https://...' },
  },
];

Edit by OnlyOffice(Menu Item/Toolbar Item in the file detail):

Create File (Toolbar Item in the file list):

Side Effects

• New prebuild, prestart, pretest npm scripts that generate extensions.config.ts
• src/app/extensions.config.ts is now git-ignored (generated from extensions.config.default.ts)

QA Notes

• Test file context menu on file list and file detail pages
• Verify "Copy Link" appears in Share submenu for files
• Verify extensions can be enabled/disabled via extensions.config.ts