OpenClaw Skill: NEAR Multi-Account Manager

Description

## Overview
Create an OpenClaw skill for managing multiple NEAR accounts from a single interface.

## Skill Commands

```python
@skill.command("near_accounts_add")
async def add_account(account_id: str, private_key: str) -> dict:
"""Add account to manager"""

@skill.command("near_accounts_list")
async def list_accounts() -> list:
"""List managed accounts"""

@skill.command("near_accounts_switch")
async def switch_active(account_id: str) -> dict:
"""Switch active account"""

@skill.command("near_accounts_aggregate")
async def aggregate_balances() -> dict:
"""Get aggregated balances across accounts"""

@skill.command("near_accounts_consolidate")
async def consolidate(to_account: str) -> dict:
"""Consolidate funds to one account"""
```

## Deliverables
1. **Multi-account skill**
2. **Aggregation tools**
3. **Published to MoltHub**

## Budget: 8 NEAR