Docs: Complete exchange configuration documentation

Update configuration documentation across all 4 languages (Chinese, English,
Russian, Ukrainian) with comprehensive exchange-related fields:

Configuration field table updates:
- Add `exchange` field (binance/hyperliquid/aster)
- Add `hyperliquid_private_key` field with 0x prefix warning
- Add `hyperliquid_wallet_addr` field
- Add `hyperliquid_testnet` field (optional, defaults to false)
- Update `ai_model` to include "custom" option
- Change Binance API key fields to show conditional requirement
  (only required when using Binance exchange)

config.json.example updates:
- Add `enabled` field to all trader configurations
- Set appropriate enabled states for example traders
- Ensure all traders have exchange field properly configured

This makes it clear to users which configuration fields are required
for each exchange option (Binance, Hyperliquid, or Aster DEX).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: tinkle-community <tinklefund@gmail.com>

config.json.example

@@ -3,6 +3,7 @@
     {
       "id": "hyperliquid_deepseek",
       "name": "Hyperliquid DeepSeek Trader",
+      "enabled": true,
       "ai_model": "deepseek",
       "exchange": "hyperliquid",
       "hyperliquid_private_key": "your_ethereum_private_key_without_0x_prefix",
@@ -15,6 +16,7 @@
     {
       "id": "binance_qwen",
       "name": "Binance Qwen Trader",
+      "enabled": true,
       "ai_model": "qwen",
       "exchange": "binance",
       "binance_api_key": "your_binance_api_key",
@@ -26,6 +28,7 @@
     {
       "id": "binance_custom",
       "name": "Binance Custom API Trader",
+      "enabled": false,
       "ai_model": "custom",
       "exchange": "binance",
       "binance_api_key": "your_binance_api_key",
@@ -35,10 +38,11 @@
       "custom_model_name": "gpt-4o",
       "initial_balance": 1000,
       "scan_interval_minutes": 3
-    }，
+    },
     {
       "id": "aster_deepseek",
       "name": "Aster DeepSeek Trader",
+      "enabled": true,
       "ai_model": "deepseek",
       "exchange": "aster",
 
@@ -47,7 +51,7 @@
       // signer: API钱包地址 (点击生成地址后生成的地址)
       // privateKey: API钱包私钥 (生成地址对应的私钥)
 
-      "aster_user": "0x63DD5aCC6b1aa0f563956C0e534DD30B6dcF7C4e", 
+      "aster_user": "0x63DD5aCC6b1aa0f563956C0e534DD30B6dcF7C4e",
       "aster_signer": "0x21cF8Ae13Bb72632562c6Fff438652Ba1a151bb0",
       "aster_private_key": "your_aster_api_wallet_private_key_without_0x_prefix",
 
@@ -69,7 +73,7 @@
     "XRPUSDT",
     "DOGEUSDT",
     "ADAUSDT",
-    "HYPEUSDT",
+    "HYPEUSDT"
   ],
   "coin_pool_api_url": "",
   "oi_top_api_url": "",