docs(cla): add Contributor License Agreement and GitHub Actions workflow

CLA.md

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+# Contributor License Agreement
+
+Thank you for your interest in contributing to oh-my-opencode ("Project"), owned by YeonGyu Kim ("Owner").
+
+By signing this Contributor License Agreement ("Agreement"), you agree to the following terms:
+
+## 1. Definitions
+
+- **"Contribution"** means any original work of authorship, including any modifications or additions to existing work, that you submit to the Project.
+- **"Submit"** means any form of communication sent to the Project, including but not limited to pull requests, issues, commits, and documentation changes.
+
+## 2. Grant of Rights
+
+By submitting a Contribution, you grant the Owner:
+
+1. **Copyright License**: A perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute your Contributions and such derivative works.
+
+2. **Patent License**: A perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Contribution.
+
+3. **Relicensing Rights**: The right to relicense the Contribution under any license, including proprietary licenses, without requiring additional permission from you.
+
+## 3. Representations
+
+You represent that:
+
+1. You are legally entitled to grant the above licenses.
+2. Each Contribution is your original creation or you have sufficient rights to submit it.
+3. Your Contribution does not violate any third party's intellectual property rights.
+4. If your employer has rights to intellectual property that you create, you have received permission to make Contributions on behalf of that employer.
+
+## 4. No Obligation
+
+You understand that:
+
+1. The Owner is not obligated to use or include your Contribution.
+2. The decision to include any Contribution is at the sole discretion of the Owner.
+3. You are not entitled to any compensation for your Contributions.
+
+## 5. Future License Changes
+
+You acknowledge and agree that:
+
+1. The Project may change its license in the future.
+2. Your Contributions may be distributed under a different license than the one in effect at the time of your Contribution.
+3. This includes, but is not limited to, relicensing under source-available or proprietary licenses.
+
+## 6. Miscellaneous
+
+- This Agreement is governed by the laws of the Republic of Korea.
+- This Agreement represents the entire agreement between you and the Owner concerning Contributions.
+
+---
+
+## How to Sign
+
+By submitting a pull request to this repository, you agree to the terms of this Contributor License Agreement. The CLA Assistant bot will automatically track your agreement.
+
+If you have any questions, please open an issue or contact the Owner.