fix(user): set ActivityPub users to ProhibitLogin (#10434)

* sets all cached ActivityPub users to ProhibitLogin
* creates a new UserType to uniquely identify users from ActivityPub

This has the side effect that ActivityPub users will no longer be listed in the admin view.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/10434
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: famfo <famfo@famfo.xyz>
Co-committed-by: famfo <famfo@famfo.xyz>

models/fixtures/user.yml

@@ -1571,13 +1571,13 @@
   email: f73240e82-c061-41ef-b7d6-4376cb6f2e1c@example.com
   keep_email_private: false
   email_notifications_preference: enabled
-  passwd: ZogKvWdyEx:password
-  passwd_hash_algo: dummy
+  passwd: ""
+  passwd_hash_algo: ""
   must_change_password: false
   login_source: 0
   login_name: federated-example.net
-  type: 5
-  salt: ZogKvWdyEx
+  type: 6
+  salt: ""
   max_repo_creation: -1
   is_active: false
   is_admin: false
@@ -1585,7 +1585,7 @@
   allow_git_hook: false
   allow_import_local: false
   allow_create_organization: false
-  prohibit_login: false
+  prohibit_login: true
   avatar: ""
   avatar_email: f73240e82-c061-41ef-b7d6-4376cb6f2e1c@example.com
   use_custom_avatar: false
@@ -1600,3 +1600,41 @@
   theme: ""
   keep_activity_private: false
   created_unix: 1759086716
+
+-
+  id: 43
+  lower_name: imported
+  name: imported
+  full_name: imported
+  email: imported@deprecated-forge.example.org
+  keep_email_private: false
+  email_notifications_preference: enabled
+  passwd: ZogKvWdyEx:password
+  passwd_hash_algo: dummy
+  must_change_password: false
+  login_source: 0
+  login_name: imported
+  type: 5
+  salt: ZogKvWdyEx
+  max_repo_creation: -1
+  is_active: false
+  is_admin: false
+  is_restricted: false
+  allow_git_hook: false
+  allow_import_local: false
+  allow_create_organization: false
+  prohibit_login: true
+  avatar: ""
+  avatar_email: imported@deprecated-forge.example.org
+  use_custom_avatar: false
+  num_followers: 0
+  num_following: 0
+  num_stars: 0
+  num_repos: 0
+  num_teams: 0
+  num_members: 0
+  visibility: 0
+  repo_admin_change_team_access: false
+  theme: ""
+  keep_activity_private: false
+  created_unix: 1765818288