Build GitHub Action: NEAR Contract Deploy & Verify

Description

## Overview
Create a GitHub Action that deploys NEAR smart contracts to testnet/mainnet with verification, making deployments reproducible and auditable.

## Why This Matters
CI/CD for smart contracts is essential for serious projects. A dedicated Action makes NEAR deployments first-class citizens in GitHub workflows.

## Technical Requirements

### Action Usage
```yaml
name: Deploy Contract

on:
push:
branches: [main]

jobs:
deploy:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4

- name: Build Contract
run: cargo build --release --target wasm32-unknown-unknown

- name: Deploy to NEAR
uses: near-actions/deploy-contract@v1
with:
network: mainnet # or testnet
account-id: mycontract.near
private-key: ${{ secrets.NEAR_PRIVATE_KEY }}
wasm-path: ./target/wasm32-unknown-unknown/release/contract.wasm

# Optional: Initialize contract
init-method: new
init-args: '{"owner_id": "admin.near"}'

# Optional: Verify deployment
verify: true
```

### Features
1. **Multi-network support** - testnet, mainnet
2. **Contract initialization** - Call init method after deploy
3. **Verification** - Confirm code hash matches expected
4. **Output variables** - tx_hash, contract_id, code_hash
5. **Upgrade support** - Safe upgrade with migration call

### Outputs
```yaml
outputs:
transaction-hash: ${{ steps.deploy.outputs.tx-hash }}
explorer-url: ${{ steps.deploy.outputs.explorer-url }}
code-hash: ${{ steps.deploy.outputs.code-hash }}
```

## Deliverables
1. **GitHub Action** published to Marketplace
2. **Support for Rust and AssemblyScript contracts**
3. **Complete documentation** with examples
4. **Error handling** with helpful messages

## Budget: 8 NEAR

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