chore(gitea-local-fork): bump to v1.26.0-unstable-2026-05-15

Picks up oleks/gitea#2 (user-scope and org-scope project board REST
endpoints under /api/v1/users/{username}/projects/... and
/api/v1/orgs/{org}/projects/...) plus the missing MoveProjectIssue
test for repo scope.

packages/gitea-local-fork.nix

@@ -35,12 +35,12 @@
 
 let
   pname = "gitea-local-fork";
-  version = "1.26.0-unstable-2026-05-12";
+  version = "1.26.0-unstable-2026-05-15";
 
   src = fetchgit {
     url = "https://git.oleks.space/oleks/gitea.git";
-    rev = "235248620e05fa4fb85ca480b0dcdc32e0f36cb5";
-    hash = "sha256-hh8TIjtWf2Ebw4MJSZXKXM8R3rk+h14VSk4w/SxITX8=";
+    rev = "580fe2df32d1a11ee94136ff6bba68f7b67c6593";
+    hash = "sha256-LH4JzOH0ZlUlSY+Xcwzyqr8Msc5bBdrlKlo42BjIEys=";
   };
 
   # Gitea's package.json requires pnpm >= 11; nixpkgs ships pnpm 10. The