Add a trademark policy for TeachLink Backend

[RUKAYAT-CODER]

Background

The Governance/ folder does not yet include a Governance/policies/TRADEMARK.md document. This is a governance gap: contributors and maintainers lack a clear, versioned reference for this area of governance. Adding the document closes the gap and keeps the change self-contained within the Governance folder.

Implementation Plan

• Create Governance/policies/TRADEMARK.md and document the protected marks.
• Specify the permitted uses.
• Define the request process for other uses.
• Add regression tests where applicable
• Document the change

Acceptance Criteria

• Governance requirement is implemented successfully
• Scope is limited to a maximum of two files
• No changes are made outside the Governance folder
• No regression in existing functionality
• Tests pass and code follows project standards
• Change is documented

[leadgenexpert454]

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