docs: add supported exchanges table and API/wallet setup guides

- Add supported exchanges table to EN, ZH-CN, JA, KO READMEs
- CEX: Binance (supported), OKX (coming soon), Bybit (coming soon)
- Perp-DEX: Hyperliquid (supported), Aster DEX (supported)
- Include referral links with fee discounts for all exchanges
- Remove What's New sections from all READMEs
- Create Binance API setup guide
- Create Hyperliquid agent wallet setup guide
- Create Aster DEX API wallet setup guide

docs/getting-started/hyperliquid-agent-wallet.md

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+# Hyperliquid Agent Wallet Setup Guide
+
+This guide explains how to create and configure an Agent Wallet for secure trading on Hyperliquid.
+
+## Why Use Agent Wallet?
+
+- ✅ **More Secure**: Never expose your main wallet private key
+- ✅ **Limited Access**: Agent only has trading permissions
+- ✅ **Revocable**: Can be disabled anytime from Hyperliquid interface
+- ✅ **Separate Funds**: Keep main holdings safe
+
+## Prerequisites
+
+- A wallet with funds on Hyperliquid
+- Access to [Hyperliquid](https://app.hyperliquid.xyz/join/AITRADING)
+
+## Step 1: Connect Your Main Wallet
+
+1. Visit [Hyperliquid](https://app.hyperliquid.xyz/join/AITRADING)
+2. Click **Connect Wallet** (top right)
+3. Choose MetaMask, WalletConnect, or other Web3 wallet
+4. Approve the connection
+
+## Step 2: Create Agent Wallet
+
+1. Click on your wallet address (top right)
+2. Go to **Settings** → **API & Agents**
+3. Or visit directly: [https://app.hyperliquid.xyz/agents](https://app.hyperliquid.xyz/agents)
+4. Click **Create Agent** or **Add Agent**
+5. System generates a new agent wallet automatically
+
+## Step 3: Save Agent Credentials
+
+After creation, save these immediately:
+
+- **Agent Wallet Address**: `0x...` (starts with 0x)
+- **Agent Private Key**: Shown only once!
+
+⚠️ **Important**: The private key is only displayed once. Save it securely!
+
+## Step 4: Configure in NOFX
+
+Add your agent wallet through the NOFX web interface:
+
+1. Open NOFX dashboard (http://localhost:3000)
+2. Go to **Exchange Configuration**
+3. Enable **Hyperliquid**
+4. Enter:
+   - **Wallet Address**: Your main wallet address (with `0x`)
+   - **Private Key**: Agent private key (remove `0x` prefix)
+5. Save configuration
+
+## Agent Wallet Details
+
+| Field | Description | Example |
+|-------|-------------|---------|
+| Main Wallet | Your connected wallet (holds funds) | `0xABC123...` |
+| Agent Wallet | Sub-wallet for trading | `0xDEF456...` |
+| Private Key | Only needed for NOFX | `abc123...` (no 0x) |
+
+## Managing Your Agent
+
+### Revoke Agent Access
+
+1. Go to [Hyperliquid Agents](https://app.hyperliquid.xyz/agents)
+2. Find your agent in the list
+3. Click **Revoke** or **Delete**
+
+### Create Multiple Agents
+
+You can create multiple agents for different purposes:
+- One for NOFX
+- One for other trading bots
+- One for manual API access
+
+## Security Best Practices
+
+- Use agent wallet instead of main wallet private key
+- Store agent private key securely
+- Revoke unused agents
+- Monitor agent activity regularly
+- Keep main wallet funds separate from trading funds
+
+## Troubleshooting
+
+| Issue | Solution |
+|-------|----------|
+| Agent not working | Check if agent is still active in Hyperliquid settings |
+| Invalid signature | Ensure private key doesn't have `0x` prefix |
+| Insufficient funds | Transfer funds to your Hyperliquid account |
+| Connection error | Check network (mainnet vs testnet) setting |