refactor: add pnpm workspace configuration and turbo build tasks

[jpoehnelt]

• Created a new pnpm-workspace.yaml file to define the workspace structure.
• Added turbo.json to configure build, development, and CI tasks for the project.

[Copilot]

Pull Request Overview

This PR refactors the project from a single-package npm project to a pnpm monorepo with Turbo for build orchestration. The existing VS Code extension has been moved into a dedicated workspace package while maintaining the same functionality.

• Introduced pnpm workspace configuration with catalog for dependency management
• Added Turbo configuration for build orchestration and task management
• Restructured the VS Code extension as a workspace package under packages/vscode-extension

Reviewed Changes

Copilot reviewed 11 out of 25 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pnpm-workspace.yaml	Defines workspace structure and shared dependency catalog
turbo.json	Configures build tasks, caching, and task dependencies
packages/vscode-extension/package.json	VS Code extension package configuration using catalog dependencies
packages/vscode-extension/README.md	Extension-specific documentation moved from root
package.json	Root package.json converted to monorepo configuration with Turbo scripts
README.md	Updated to reflect monorepo structure
.husky/*	Updated Git hooks to use pnpm instead of npm
.github/workflows/*	Updated CI workflows for pnpm and monorepo structure

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[Copilot]

Pull Request Overview

Copilot reviewed 11 out of 25 changed files in this pull request and generated 3 comments.

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