Support Forgejo servers

TESTING.md

@@ -94,6 +94,9 @@ answer before uploading it to App Store Connect.
 - [ ] With no configured server, Issues and Repos show the Servers screen and
       its empty state.
 - [ ] The add button presents Add Server; Cancel dismisses it.
+- [ ] API provider is a native single-selection menu with Gitea selected by
+      default and Forgejo available; selecting either updates the displayed
+      value, VoiceOver value, and URL example.
 - [ ] Name, Server URL, and Access token use native text fields and suitable
       keyboards; Next advances between fields and Done submits.
 - [ ] Long-press in every field shows the native loupe, insertion point, and
@@ -104,7 +107,12 @@ answer before uploading it to App Store Connect.
 - [ ] The token is obscured, remains editable, and does not trigger a password
       save prompt.
 - [ ] Empty or invalid values show an error without adding a server.
-- [ ] Valid credentials add and select the server; all data tabs load.
+- [ ] Valid Gitea credentials add and select the server; all data tabs load.
+- [ ] Valid Forgejo credentials add and select the server; repositories,
+      issues, milestones, pulls, activity, commits, files, and mutations use
+      the same native screens and load successfully.
+- [ ] Leave Gitea selected while adding a modern Forgejo server; provider
+      discovery identifies Forgejo and the server works after relaunch.
 - [ ] Terminate and relaunch the app; the selected server and Keychain token
       still work without re-entry.
 - [ ] Open the server picker from a repository list and switch between at least