Fix project counter in organization/individual profile (#28068)

Fix #28052
Before:

![image](https://github.com/go-gitea/gitea/assets/18380374/5f299983-4b38-4d68-ac0e-4be3c62c0558)

![image](https://github.com/go-gitea/gitea/assets/18380374/f0e12afd-483b-4882-80e9-0261beb3fe0c)

After:

![image](https://github.com/go-gitea/gitea/assets/18380374/47cccb7b-bb35-4a7d-9c5b-83133be0323a)

![image](https://github.com/go-gitea/gitea/assets/18380374/77825c0c-4bf2-4762-83a2-1a5a173cc22d)

routers/web/shared/user/header.go

@@ -7,6 +7,7 @@ import (
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/organization"
 	access_model "code.gitea.io/gitea/models/perm/access"
+	project_model "code.gitea.io/gitea/models/project"
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unit"
 	user_model "code.gitea.io/gitea/models/user"
@@ -134,5 +135,21 @@ func LoadHeaderCount(ctx *context.Context) error {
 	}
 	ctx.Data["RepoCount"] = repoCount
 
+	var projectType project_model.Type
+	if ctx.ContextUser.IsOrganization() {
+		projectType = project_model.TypeOrganization
+	} else {
+		projectType = project_model.TypeIndividual
+	}
+	projectCount, err := project_model.CountProjects(ctx, project_model.SearchOptions{
+		OwnerID:  ctx.ContextUser.ID,
+		IsClosed: util.OptionalBoolOf(false),
+		Type:     projectType,
+	})
+	if err != nil {
+		return err
+	}
+	ctx.Data["ProjectCount"] = projectCount
+
 	return nil
 }