first commit, i i have no idea what i have done

server/internal/crypto/jwt.go

@@ -0,0 +1,30 @@
+package crypto
+
+import (
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type JWTManager struct {
+	secret []byte
+}
+
+func NewJWT(secret []byte) *JWTManager {
+	return &JWTManager{secret: secret}
+}
+
+func (j *JWTManager) Generate(userID uint, username, role string) (string, error) {
+	t := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
+		"sub":  userID,
+		"name": username,
+		"role": role,
+		"iat":  time.Now().Unix(),
+		"exp":  time.Now().Add(24 * time.Hour).Unix(),
+	})
+	return t.SignedString(j.secret)
+}
+
+func (j *JWTManager) Parse(tok string) (*jwt.Token, error) {
+	return jwt.Parse(tok, func(t *jwt.Token) (interface{}, error) { return j.secret, nil })
+}