Simplify Swagger authentication field headers to "User Login"

[Copilot]

Problem

The Swagger UI authentication section displayed a technical and user-unfriendly header text "OAuth2PasswordOrClientCredentialsBearer (OAuth2, password)" which was confusing for end users trying to authenticate with the API.

Solution

Added JavaScript code to the existing Swagger UI customization that:

1. Listens for the nmdcInit event (as suggested in the issue)
2. Searches for DOM elements containing the technical OAuth2 authentication text
3. Replaces both "OAuth2PasswordOrClientCredentialsBearer (OAuth2, password)" and "OAuth2PasswordOrClientCredentialsBearer" with the user-friendly "User Login" text
4. Uses a 500ms timeout to ensure Swagger UI has fully rendered before making changes

Implementation Details

The change is minimal and surgical - only 15 lines of JavaScript added to /nmdc_runtime/api/swagger_ui/assets/script.js. The modification:

• Preserves all existing functionality
• Only changes the display text, not the underlying authentication mechanism
• Uses the existing nmdcInit event infrastructure already in place
• Applies the change client-side without affecting server-side authentication logic

Testing

Created and tested a standalone HTML page that simulates the authentication section behavior. The test confirms that the text replacement works correctly for both the full technical text and shortened versions.

This change significantly improves the usability of the Swagger UI by making the authentication section more accessible and less intimidating for end users.

Fixes #895.

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[shreddd]

@eecavanna - lmk if this solution looks ok to you.

[eecavanna]

Thanks, @shreddd. At first glance, I am nervous about the fact that Copilot has introduced a setTimeout to wait for DOM elements to load. I'll review this later today and edit/approve/merge.