GiteaPR: native iOS app to manage Gitea pull requests

Multi-repo PR inbox, review (approve/request changes/comment), merge with
gating toggle, read-only diff viewer, and Gitea Actions check status with
one-tap re-run. Ships unsigned via the iMac runner to the SideStore source.

GiteaPR/AppSession.swift

@@ -0,0 +1,8 @@
+import Foundation
+
+/// Lightweight in-memory session — holds the current user's login for
+/// "assigned to me" / "created by me" filters. Populated by the Settings
+/// "Test connection" call via /user.
+enum AppSession {
+    static var currentLogin: String = ""
+}