fix: remove force flag from push_to_gitea heads refspec to avoid overwriting Gitea commits

svn_mirror/gitea.py

@@ -82,10 +82,13 @@ def push_to_gitea(mirror: Mirror) -> bool:
 
     # Gitea fetches from canonical — this transfers objects + refs,
     # and DOES NOT trigger Gitea's pre-receive hook.
+    # NOTE: no `+` prefix on heads — only fast-forward allowed.
+    # If Gitea is ahead (user pushed there), this fetch is a no-op
+    # and `fetch_from_gitea` brings those commits into canonical next.
     _git(
         "--git-dir", str(gitea_path), "fetch", "--prune",
         canonical,
-        "+refs/heads/*:refs/heads/*",
+        "refs/heads/*:refs/heads/*",
         "+refs/tags/*:refs/tags/*",
         timeout=300,
     )