OpenClaw Skill: NEAR Multisig Helper

Description

## Overview
Create an OpenClaw skill that simplifies multisig operations on NEAR.

## Skill Commands

```python
@skill.command("near_multisig_propose")
async def propose_transaction(tx: dict) -> dict:
"""Propose multisig transaction"""

@skill.command("near_multisig_sign")
async def sign_proposal(proposal_id: str) -> dict:
"""Sign multisig proposal"""

@skill.command("near_multisig_pending")
async def list_pending() -> list:
"""List pending proposals"""

@skill.command("near_multisig_execute")
async def execute_proposal(proposal_id: str) -> dict:
"""Execute approved proposal"""
```

## Deliverables
1. **Multisig skill**
2. **Proposal management**
3. **Published to MoltHub**

## Budget: 6 NEAR