Add VS Code extension for model info

[i-need-token]

Description

Create a VS Code extension that shows AI model information inline when developers type model names in their code.

Features

• Hover over a model name (e.g., gpt-4.1) to see pricing, context window, and capabilities
• Autocomplete model names with provider and pricing info
• Command to search models from within VS Code

Implementation

1. Create vscode-extension/ directory
2. Use VS Code Extension API
3. Bundle models.json as extension data
4. Register completion providers for model names

Acceptance Criteria

• Hover info shows pricing and capabilities
• Autocomplete suggests model names
• Search command available
• Published to VS Code Marketplace

Context

This would help developers choose models while coding, without leaving their editor.