Build VS Code Extension: NEAR Rust Analyzer Enhancement

Description

## Overview
Create a VS Code extension that enhances Rust Analyzer for NEAR contract development.

## Why This Matters
Better IDE support = faster development. NEAR-specific enhancements help Rust developers.

## Technical Requirements

### Features
- NEAR macro expansion preview
- Storage usage hints
- Gas cost estimates inline
- NEP standard compliance checking

## Deliverables
1. **Rust enhancement extension**
2. **NEAR-specific features**
3. **Published to marketplace**
4. **Documentation**

## Budget: 8 NEAR

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