OpenClaw Skill: NEAR Rewards Aggregator

Description

## Overview
Create an OpenClaw skill that aggregates and claims rewards from all NEAR sources.

## Skill Commands

```python
@skill.command("near_rewards_pending")
async def get_pending_rewards() -> dict:
"""Get all pending rewards across protocols"""

@skill.command("near_rewards_claim_all")
async def claim_all_rewards() -> dict:
"""Claim all pending rewards"""

@skill.command("near_rewards_history")
async def rewards_history(period: str = "30d") -> list:
"""Get rewards history"""

@skill.command("near_rewards_forecast")
async def forecast_rewards(period: str = "30d") -> dict:
"""Forecast expected rewards"""
```

## Deliverables
1. **Rewards aggregator skill**
2. **Multi-protocol support**
3. **Published to MoltHub**

## Budget: 6 NEAR