add funding.json

[marten-seemann]

With this, we can apply to https://floss.fund.

[Copilot]

Pull Request Overview

This PR adds funding configuration files to enable the project to apply for floss.fund funding. The changes create a standardized funding manifest that declares the project maintainer information, project details, and available sponsorship tiers.

• Adds a comprehensive funding.json manifest with maintainer and project information
• Creates a well-known funding manifest URL reference file
• Establishes multiple sponsorship tiers from individual ($25/month) to enterprise+ ($11,000/month)

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
static/funding.json	Complete funding manifest with maintainer details, project descriptions, and sponsorship plans
static/.well-known/funding-manifest-urls	Well-known URL reference pointing to the funding manifest

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