chore: add copyright

[sriramveeraghanta]

Description

• Adding copyright txt
• Adding CI to check copyright information

Type of Change

• Documentation update

[coderabbitai]

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[Copilot]

Pull request overview

This PR adds copyright headers to Python and TypeScript/TSX files across the repository and introduces a CI workflow to enforce copyright presence in future changes.

Changes:

• Added standardized copyright headers (2023-present Plane Software, Inc., AGPL-3.0-only) to all tracked source files
• Created CI workflow to validate copyright headers on pull requests
• Added documentation for manual copyright verification and application

Reviewed changes

Copilot reviewed 300 out of 4130 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
COPYRIGHT.txt	Copyright header template for automated tooling
COPYRIGHT_CHECK.md	Documentation for manual copyright verification process
.github/workflows/copyright-check.yml	CI workflow for automated copyright validation
apps/api/**/*.py	Added copyright headers to Python API files
apps/admin/**/.ts, **/.tsx	Added copyright headers to TypeScript admin app files
manage.py	Added copyright header to Django management script

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