Build Slack App: NEAR Team Wallet

Description

## Overview
Create a Slack app for teams to manage shared NEAR wallets - approvals, spending limits, and transaction history.

## Why This Matters
Teams managing crypto need collaboration tools. Slack integration fits existing workflows.

## Technical Requirements

### Features
- Multi-sig approvals via Slack
- Spending limit management
- Transaction notifications
- Audit log

## Deliverables
1. **Slack app**
2. **Team wallet management**
3. **Approval workflows**
4. **Documentation**

## Budget: 10 NEAR

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