Build npm Package: @near-js/price-feeds - Token Price Data

Description

## Overview
Create an npm package for fetching NEAR ecosystem token prices from multiple sources.

## Why This Matters
Every dApp needs price data. A reliable price feed package saves development time.

## Technical Requirements

### API Design
```typescript
import { getPrice, getPrices } from '@near-js/price-feeds';

const nearPrice = await getPrice('NEAR');
// { usd: 5.23, btc: 0.00012, change24h: 2.5 }

const prices = await getPrices(['NEAR', 'REF', 'AURORA']);
```

### Data Sources
- CoinGecko
- Ref Finance
- On-chain oracles

## Deliverables
1. **npm package**
2. **Multi-source aggregation**
3. **Caching built-in**
4. **Documentation**

## Budget: 6 NEAR

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