fix(packages): Add label for private and internal package and fix composor package source permission check (#37610) (#37643)

Backport #37610 by @lunny

- Add permission checks for Composer package source links

- Add private/internal visibility labels for packages, similar to
repository visibility labels

<img width="969" height="571" alt="image"
src="https://github.com/user-attachments/assets/8a8ec3a0-bfbd-4dd6-b45b-58eda5db1a2d"
/>

- Add a link to change package visibility

<img width="1309" height="208" alt="image"
src="https://github.com/user-attachments/assets/3fa82b23-4c63-4a5e-b3f0-d37a103231ee"
/>

- Update link package descriptions

<img width="1308" height="265" alt="image"
src="https://github.com/user-attachments/assets/2c80b50e-5ffe-4d96-aedd-aa15964c4e05"
/>

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Nicolas <bircni@icloud.com>
Co-authored-by: silverwind <me@silverwind.io>

models/user/user.go

@@ -307,6 +307,13 @@ func (u *User) DashboardLink() string {
 	return setting.AppSubURL + "/"
 }
 
+func (u *User) SettingsLink() string {
+	if u.IsOrganization() {
+		return u.OrganisationLink() + "/settings"
+	}
+	return setting.AppSubURL + "/user/settings"
+}
+
 // HomeLink returns the user or organization home page link.
 func (u *User) HomeLink() string {
 	return setting.AppSubURL + "/" + url.PathEscape(u.Name)