fix(tests): improve concurrency handling in worker tests and enhance module cloning

- Added environment variable `EVOBGP_JOB_MAX_CONCURRENT` to control job concurrency in tests.
- Modified worker test to ensure proper synchronization of job processing by holding workers until both jobs are enqueued.
- Updated memory store methods to return cloned module instances, preventing unintended mutations of original modules during operations.

internal/store/memory.go

@@ -414,6 +414,9 @@ func (m *Memory) ListModules(tenantID string) []*Module {
 		}
 		return out[i].Name < out[j].Name
 	})
+	for i := range out {
+		out[i] = cloneModule(out[i])
+	}
 	return out
 }
 
@@ -446,7 +449,7 @@ func (m *Memory) GetModule(tenantID, moduleID string) (*Module, error) {
 	if mod.TenantID != tenantID {
 		return nil, ErrTenantScope
 	}
-	return mod, nil
+	return cloneModule(mod), nil
 }
 
 func (m *Memory) GetRevision(tenantID, revisionID string) (*Revision, error) {
@@ -684,3 +687,24 @@ func (m *Memory) ListRevisions(tenantID, moduleID string, cursor string, limit i
 	}
 	return page, nextCursor, hasMore
 }
+
+func cloneStringPtr(s *string) *string {
+	if s == nil {
+		return nil
+	}
+	v := *s
+	return &v
+}
+
+func cloneModule(m *Module) *Module {
+	if m == nil {
+		return nil
+	}
+	cp := *m
+	cp.DefaultCommunityID = cloneStringPtr(m.DefaultCommunityID)
+	cp.DohProfileID = cloneStringPtr(m.DohProfileID)
+	cp.DohProfileIDs = append([]string(nil), m.DohProfileIDs...)
+	cp.LastRefreshedAt = cloneTime(m.LastRefreshedAt)
+	cp.DeletedAt = cloneTime(m.DeletedAt)
+	return &cp
+}

internal/store/memory_crud.go

@@ -38,7 +38,7 @@ func (m *Memory) CreateModule(tenantID string, in *Module) (*Module, error) {
 	}
 	NormalizeModuleDoh(mod)
 	m.modules[id] = mod
-	return mod, nil
+	return cloneModule(mod), nil
 }
 
 func (m *Memory) UpdateModule(tenantID, moduleID string, patch *ModulePatch) (*Module, error) {
@@ -74,12 +74,14 @@ func (m *Memory) UpdateModule(tenantID, moduleID string, patch *ModulePatch) (*M
 			mod.DefaultCommunityID = &v
 		}
 	}
-	ApplyModuleDohPatch(mod, patch)
+	if patch.DohProfileIDs != nil || patch.DohProfileID != nil || patch.DohResolverPolicy != nil {
+		ApplyModuleDohPatch(mod, patch)
+	}
 	if patch.LastRefreshedAt != nil {
 		t := patch.LastRefreshedAt.UTC()
 		mod.LastRefreshedAt = &t
 	}
-	return mod, nil
+	return cloneModule(mod), nil
 }
 
 func (m *Memory) SoftDeleteModule(tenantID, moduleID string) error {