[fix]. Harden fork PR fetch + config marker

src/gitea_codex_bot/services/gitea.py

@@ -21,6 +21,8 @@ class PullRequestContext:
     clone_url: str
     html_url: str
     is_fork: bool
+    base_clone_url: str | None = None
+    head_clone_url: str | None = None
 
 
 class GiteaClient:
@@ -56,6 +58,8 @@ class GiteaClient:
         encoded_owner = quote(owner, safe="")
         encoded_name = quote(name, safe="")
         payload = self._request("GET", f"/api/v1/repos/{encoded_owner}/{encoded_name}/pulls/{pr_number}")
+        base_clone_url = payload["base"]["repo"]["clone_url"]
+        head_clone_url = payload["head"]["repo"]["clone_url"]
         return PullRequestContext(
             repo=repo,
             pr_number=pr_number,
@@ -63,7 +67,9 @@ class GiteaClient:
             base_sha=payload["base"]["sha"],
             head_ref=payload["head"]["ref"],
             head_sha=payload["head"]["sha"],
-            clone_url=payload["head"]["repo"]["clone_url"],
+            clone_url=head_clone_url,
+            base_clone_url=base_clone_url,
+            head_clone_url=head_clone_url,
             html_url=payload["html_url"],
             is_fork=bool(payload["head"]["repo"]["full_name"] != payload["base"]["repo"]["full_name"]),
         )