Implement DDEV plugin with installation instructions, CI/CD workflow

[JUVOJustin]

This pull request introduces a production-ready release workflow and prepares the plugin for npm distribution. It adds a deployment GitHub Actions workflow, creates a proper package.json for npm publishing, improves documentation for easier installation, and makes minor code and packaging adjustments.

Deployment and Packaging Improvements:

• Added a GitHub Actions workflow (.github/workflows/deploy.yml) to automate deployment on tag push, including version bumping, building, committing, and publishing to npm.
• Created a package.json file with metadata, scripts, dependencies, and npm publishing configuration for the opencode-ddev plugin.
• Updated .npmignore to exclude tsconfig.json from npm packages, reducing package size and unnecessary files.

Documentation Updates:

• Updated README.md to provide npm-based installation instructions, replacing the previous submodule approach, and added update instructions for users.

Code Maintenance:

• Fixed import path in logs.ts to use the correct @opencode-ai/plugin/tool submodule.… and TypeScript configuration