Add support for Gitea and Forgejo in token handling

- Enhanced the `with_token` function to support Gitea and Forgejo URLs by constructing the appropriate authentication format for generic HTTPS.
- Updated tests to validate the new functionality, ensuring correct token injection for Gitea URLs while maintaining existing behavior for GitHub and GitLab.
- Improved overall robustness of token handling across different platforms.

src/gpu_rent/remote/clone_ext.py

@@ -47,6 +47,16 @@ def with_token(url: str, token: str) -> str:
         return "https://x-access-token:" + token + "@github.com/" + url[len("https://github.com/") :]
     if url.startswith("https://gitlab.com/"):
         return "https://oauth2:" + token + "@gitlab.com/" + url[len("https://gitlab.com/") :]
+    # Gitea / Forgejo / generic HTTPS — oauth2:TOKEN@host (skip if URL already has userinfo)
+    if url.startswith("https://"):
+        parts = urlsplit(url)
+        if parts.hostname and not parts.username:
+            netloc = f"oauth2:{token}@{parts.hostname}"
+            if parts.port:
+                netloc = f"{netloc}:{parts.port}"
+            return urlunsplit(
+                (parts.scheme, netloc, parts.path, parts.query, parts.fragment)
+            )
     return url