feat: add xyz dex balance calculation, market data providers, and UI improvements

- Fix xyz dex balance calculation (use marginSummary for isolated margin)
- Add Alpaca provider for US stocks market data
- Add TwelveData provider for forex & metals market data
- Add Hyperliquid kline provider
- Centralize API keys in config system
- Add builder fee for order routing
- Improve chart UI with compact design
- Fix position history fee display precision
- Add comprehensive balance calculation tests

config/config.go

@@ -29,6 +29,11 @@ type Config struct {
 	// Helps us understand product usage and improve the experience
 	// Set EXPERIENCE_IMPROVEMENT=false to disable
 	ExperienceImprovement bool
+
+	// Market data provider API keys
+	AlpacaAPIKey    string // Alpaca API key for US stocks
+	AlpacaSecretKey string // Alpaca secret key
+	TwelveDataKey   string // TwelveData API key for forex & metals
 }
 
 // Init initializes global configuration (from .env)
@@ -76,6 +81,11 @@ func Init() {
 		cfg.ExperienceImprovement = strings.ToLower(v) != "false"
 	}
 
+	// Market data provider API keys
+	cfg.AlpacaAPIKey = os.Getenv("ALPACA_API_KEY")
+	cfg.AlpacaSecretKey = os.Getenv("ALPACA_SECRET_KEY")
+	cfg.TwelveDataKey = os.Getenv("TWELVEDATA_API_KEY")
+
 	global = cfg
 
 	// Initialize experience improvement (installation ID will be set after database init)