feat: add Forgejo saas wrapper

Mirrors the Bitbucket wrapper against the Forgejo REST API v1:
token auth headers, repository existence check, repository
creation under the authenticated user or an organization. No
instance URL is hardcoded — Forgejo is self-hosted, so every
operation takes a host parameter. Exposes both ssh_clone_url
and https_clone_url (HTTPS needed in CI without SSH host keys).

src/byteb4rb1e/utils/saas/forgejo.py

@@ -0,0 +1,98 @@
+#!/usr/bin/env python3
+"""Forgejo REST API v1 wrapper.
+
+Thin layer over http.py for Forgejo-specific operations:
+
+- Token authentication
+- Repository existence checks
+- Repository creation under the authenticated user or an organization
+- SSH and HTTPS clone URL construction
+
+Unlike Bitbucket (one global SaaS instance), Forgejo is self-hosted,
+so every operation takes a *host* parameter instead of baking any
+specific instance in.
+"""
+
+import json
+from typing import Any, Dict, Optional
+
+from byteb4rb1e.utils.http import client as http_client
+
+
+def api_url(host: str) -> str:
+    """Return the API base URL for a Forgejo instance."""
+    return f"https://{host}/api/v1"
+
+
+def http_headers(token: str) -> Dict[str, str]:
+    """Construct Forgejo API headers with token auth."""
+    return {
+        "Authorization": f"token {token}",
+        "Accept": "application/json",
+        "Content-Type": "application/json",
+    }
+
+
+def repository_exists(
+    host: str,
+    owner: str,
+    repo_slug: str,
+    token: str,
+) -> bool:
+    """Check whether a repository exists under the owner."""
+    url = f"{api_url(host)}/repos/{owner}/{repo_slug}"
+    resp = http_client.get(url, headers=http_headers(token))
+    return bool(resp.status_code == 200)
+
+
+def create_repository(
+    host: str,
+    repo_slug: str,
+    token: str,
+    org: Optional[str] = None,
+    description: str = "",
+    is_private: bool = True,
+) -> http_client.HttpResponse:
+    """Create a new repository on the Forgejo instance.
+
+    When *org* is given the repository is created in that
+    organization, otherwise under the authenticated user.
+
+    Returns the API response.  Caller should check status_code == 201
+    for success.
+    """
+    if org:
+        url = f"{api_url(host)}/orgs/{org}/repos"
+    else:
+        url = f"{api_url(host)}/user/repos"
+    body: Dict[str, Any] = {
+        "name": repo_slug,
+        "private": is_private,
+        "description": description,
+    }
+    return http_client.post(
+        url,
+        data=json.dumps(body).encode("utf-8"),
+        headers=http_headers(token),
+    )
+
+
+def ssh_clone_url(
+    host: str,
+    owner: str,
+    repo_slug: str,
+) -> str:
+    """Return the SSH clone URL for a Forgejo repository."""
+    return f"git@{host}:{owner}/{repo_slug}.git"
+
+
+def https_clone_url(
+    host: str,
+    owner: str,
+    repo_slug: str,
+) -> str:
+    """Return the HTTPS clone URL for a Forgejo repository.
+
+    Preferred in CI environments without SSH host keys.
+    """
+    return f"https://{host}/{owner}/{repo_slug}.git"