OpenClaw Skill: NEAR IPFS Integration

Description

## Overview
Create an OpenClaw skill for IPFS operations commonly used with NEAR - NFT metadata, decentralized storage.

## Skill Commands

```python
@skill.command("near_ipfs_upload")
async def upload_to_ipfs(file_path: str) -> dict:
"""Upload file to IPFS"""

@skill.command("near_ipfs_pin")
async def pin_content(cid: str) -> dict:
"""Pin content on IPFS"""

@skill.command("near_ipfs_fetch")
async def fetch_content(cid: str) -> bytes:
"""Fetch content from IPFS"""

@skill.command("near_ipfs_nft_metadata")
async def create_nft_metadata(name: str, description: str, image_cid: str) -> dict:
"""Create and upload NFT metadata"""
```

## Deliverables
1. **IPFS skill**
2. **NFT metadata helpers**
3. **Published to MoltHub**

## Budget: 6 NEAR