🧪 test: add GODOG_STOP_ON_FAILURE environment variable support

- Add GODOG_STOP_ON_FAILURE environment variable to all test suites
- Maintain feature-specific defaults for stop on failure behavior
- JWT, Greet, Auth, Health: stop on failure by default (true)
- Config, All Features: continue after failures by default (false)
- Allow runtime override via environment variable
- Update BDD_TAGS.md with usage examples and defaults
- Support boolean values: true, false, 1, 0

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistralai.com>

features/jwt/jwt_test.go

@@ -20,6 +20,12 @@ func TestJWTBDD(t *testing.T) {
 		tags = "~@flaky && ~@todo && ~@skip"
 	}
 
+	// Allow stop on failure override via environment variable
+	stopOnFailure := true // Default for JWT tests
+	if envStop := os.Getenv("GODOG_STOP_ON_FAILURE"); envStop != "" {
+		stopOnFailure = envStop == "true" || envStop == "1"
+	}
+
 	suite := godog.TestSuite{
 		Name:                 "dance-lessons-coach BDD Tests - JWT Feature",
 		TestSuiteInitializer: bdd.InitializeTestSuite,
@@ -30,7 +36,7 @@ func TestJWTBDD(t *testing.T) {
 			TestingT:      t,
 			Strict:        true,
 			Randomize:     -1,
-			StopOnFailure: false,
+			StopOnFailure: stopOnFailure,
 			Tags:          tags,
 		},
 	}