chore: add FUNDING.yml (CEO Audit sustainability gate)

[Delqhi]

Adds GitHub Sponsors metadata so the repo shows the Sponsor button. Free MIT code stays free; sponsor link funds benchmark runs, OCI VM upgrades, and maintainer time. See sponsor policy at https://opensin-ai.github.io/Infra-SIN-OpenCode-Stack/sponsor/

Co-authored-by: v0[bot] <v0[bot]@users.noreply.github.com>

Summary by CodeRabbit

• Chores
  • Added GitHub Sponsors configuration, enabling project sponsorship support through GitHub Sponsors and a custom sponsorship channel.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 8103ef6e-e6dc-4cb2-8c0c-0c934a91420c

📥 Commits

Reviewing files that changed from the base of the PR and between 08452ad and ac9769e.

📒 Files selected for processing (1)

• .github/FUNDING.yml

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📝 Walkthrough

Walkthrough

A new GitHub Sponsors funding configuration file is added to the repository, establishing sustainable funding pathways through GitHub Sponsors and a custom OpenSIN sponsorship link.

Changes

GitHub Funding Configuration

Layer / File(s)	Summary
Funding Config .github/FUNDING.yml	New funding file created with GitHub sponsor handle Delqhi and custom sponsorship URL for OpenSIN "Infra-SIN-OpenCode-Stack".

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A sponsor's wish, now set in stone,
With funding paths both far and known,
From Delqhi's support, so bold and bright,
OpenSIN shines with sustainable light! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ceo/funding-1777790520924

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