feat(exchange): add Bybit Futures support (#1100)

* feat(exchange): add Bybit Futures support
- Add Bybit Go SDK dependency (github.com/bybit-exchange/bybit.go.api)
- Create trader/bybit_trader.go implementing Trader interface for USDT perpetual futures
- Update config/database.go to include Bybit in default exchanges
- Update manager/trader_manager.go to handle Bybit API key configuration
- Update trader/auto_trader.go to add BybitAPIKey/BybitSecretKey fields and bybit case
- Add Bybit icon to frontend ExchangeIcons.tsx
Bybit uses standard API Key/Secret Key authentication (similar to Binance).
Only USDT perpetual futures (category=linear) are supported.
Co-Authored-By: tinkle-community <tinklefund@gmail.com>
* test(bybit): add comprehensive unit tests for Bybit trader
- Add BybitTraderTestSuite following existing test patterns
- Interface compliance test (Trader interface)
- Symbol format validation tests
- FormatQuantity tests with 3-decimal precision
- API response parsing tests (success, error, permission denied)
- Position side conversion tests (Buy->long, Sell->short)
- Cache duration verification test
- Mock server integration tests for API endpoints
All 12 Bybit tests pass.
Co-Authored-By: tinkle-community <tinklefund@gmail.com>
* fix(frontend): add Bybit support to exchange config forms
修復前端對 Bybit 交易所的支持：
- 添加 Bybit 到 API Key/Secret Key 輸入欄位顯示邏輯
- 添加 Bybit 的表單驗證邏輯
- 修復 ExchangeConfigModal.tsx 和 AITradersPage.tsx
Co-Authored-By: tinkle-community <tinklefund@gmail.com>
---------
Co-authored-by: the-dev-z <the-dev-z@users.noreply.github.com>
Co-authored-by: tinkle-community <tinklefund@gmail.com>

config/database.go

@@ -305,6 +305,7 @@ func (d *Database) initDefaultData() error {
 		id, name, typ string
 	}{
 		{"binance", "Binance Futures", "binance"},
+		{"bybit", "Bybit Futures", "bybit"},
 		{"hyperliquid", "Hyperliquid", "hyperliquid"},
 		{"aster", "Aster DEX", "aster"},
 		{"lighter", "LIGHTER DEX", "lighter"},
@@ -869,6 +870,9 @@ func (d *Database) UpdateExchange(userID, id string, enabled bool, apiKey, secre
 		if id == "binance" {
 			name = "Binance Futures"
 			typ = "cex"
+		} else if id == "bybit" {
+			name = "Bybit Futures"
+			typ = "cex"
 		} else if id == "hyperliquid" {
 			name = "Hyperliquid"
 			typ = "dex"