Integrate frappe.ui.FileUploader for image uploads in editor

[Copilot]

This PR integrates the Frappe framework's file library (frappe.ui.FileUploader) with the frappe-editor, replacing the default direct upload mechanism while maintaining backward compatibility.

Changes Made

Core Integration:

• Added custom upload function that detects and uses frappe.ui.FileUploader when available in Frappe environment
• Implemented the exact integration pattern specified in the issue:

  new frappe.ui.FileUploader({
    doctype: me.doctype,
    docname: me.docname,
    frm: me,
    files: [file],
    folder: "Home/Attachments",
    on_success(file_doc) { /* handles success */ },
    on_error(error) { /* handles errors */ }
  });

New Props for Document Context:

• doctype: Associates uploaded files with the current document type
• docname: Associates uploaded files with the current document
• frm: Provides form context to the file uploader
• folder: Specifies destination folder (defaults to "Home/Attachments")

Automatic Context Passing:

• Updated the Frappe form control to automatically pass document context from the current form
• Files uploaded through the editor are now properly linked to the document being edited
• Uses Frappe's file management system instead of bypassing it

Backward Compatibility:

• Falls back to frappe-ui's default upload behavior when not in a Frappe environment
• No breaking changes to existing functionality
• Maintains compatibility for standalone usage

Benefits

• Proper File Management: Images are now managed through Frappe's file library with proper permissions and organization
• Document Association: Uploaded files are automatically linked to the current document
• Consistent UX: Uses the same file upload patterns as the rest of the Frappe framework
• No Breaking Changes: Existing implementations continue to work without modification

The editor now seamlessly integrates with Frappe's built-in file management while preserving all existing functionality.

Fixes #1.

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