Added code for backend glue

backend/internal/config/config.go

@@ -0,0 +1,23 @@
+package config
+
+import (
+	"os"
+)
+
+type Config struct {
+	DSN        string // e.g. mysql: "user:pass@tcp(127.0.0.1:3306)/mind?parseTime=true"; sqlite: "file:mind.db?_pragma=busy_timeout(5000)"
+	Driver     string // "mysql" or "sqlite"
+	JWTSecret  string
+	Port       string // default 8080
+}
+
+func getenv(k, def string) string { v := os.Getenv(k); if v == "" { return def }; return v }
+
+func Load() Config {
+	return Config{
+		DSN:       getenv("DB_DSN", "file:mind.db?_pragma=busy_timeout(5000)"),
+		Driver:    getenv("DB_DRIVER", "sqlite"),
+		JWTSecret: getenv("JWT_SECRET", "devsecret"),
+		Port:      getenv("PORT", "8080"),
+	}
+}