feat: initial release v0.3.0

- Support 9 chart types: line, bar, pie, scatter, bubble, donut, mixed, polar, radar
- Multi-format output: ANSI, SVG, PNG, Markdown
- Go + Fiber + gonum/plot
- Docker support
- Morandi color palette

internal/config/config.go

@@ -0,0 +1,34 @@
+package config
+
+import (
+	"os"
+	"strconv"
+)
+
+type Config struct {
+	ServerPort string
+	BaseURL    string
+}
+
+func Load() *Config {
+	return &Config{
+		ServerPort: getEnv("SERVER_PORT", "3100"),
+		BaseURL:    getEnv("BASE_URL", "http://localhost:3100"),
+	}
+}
+
+func getEnv(key, defaultValue string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return defaultValue
+}
+
+func getEnvAsInt(key string, defaultValue int) int {
+	if value := os.Getenv(key); value != "" {
+		if intValue, err := strconv.Atoi(value); err == nil {
+			return intValue
+		}
+	}
+	return defaultValue
+}