Move OpenClaw logic into dedicated module; add UI, styles, CI and GitHub templates

[Millerderek]

Motivation

• Separate bot behavior from UI so the OpenClaw implementation is visible in the codebase and easier to maintain.
• Surface the new module in docs and CI so repository structure and syntax checks reflect the change.
• Provide basic repo hygiene and collaboration files (templates, license, ignore) for contributors.

Description

• Add src/openclaw.js which exports the OpenClaw system prompt, createOpenClawInitialMessages(), toGeminiPayload() and callGeminiChat() to encapsulate Gemini payload mapping and API calls.
• Refactor src/app.js to import and use createOpenClawInitialMessages() and callGeminiChat() so UI/voice logic is separated from model logic.
• Add UI and assets: index.html and src/styles.css to provide a basic web UI and styling.
• Add repository files: .github/workflows/ci.yml (syntax checks), issue/PR templates under .github/ISSUE_TEMPLATE/, .gitignore, and LICENSE, and update README.md to show the new src/openclaw.js location.

Testing

• Ran node --check src/openclaw.js which completed successfully.
• Ran node --check src/app.js which completed successfully.

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Codex Task