feat(toolchain): CI failure mail includes direct CI run URL

Extract commit sha from CI comment body, query Gitea commit status
API to get the failed job's target_url, and include it in the Mail.

src/api/toolchain_routes.py

@@ -459,11 +459,33 @@ async def _handle_issue_comment(payload: Dict[str, Any]) -> None:
     # 提取错误摘要（取 comment body 前 500 字符）
     error_summary = body[:500] if body else "(无错误信息)"
 
+    # 尝试从 commit sha 查询 CI run URL
+    ci_url = ""
+    sha_match = re.search(r"commit:\s*`?([0-9a-f]{40})`?", body)
+    if sha_match:
+        try:
+            resp = requests.get(
+                f"{_GITEA_BASE}/commits/{sha_match.group(1)}/status",
+                headers={"Authorization": f"token {_GITEA_TOKEN}"},
+                timeout=5,
+            )
+            if resp.ok:
+                statuses = resp.json().get("statuses", [])
+                for s in statuses:
+                    if s.get("status") == "failure" or s.get("state") == "failure":
+                        target = s.get("target_url", "")
+                        if target:
+                            ci_url = "http://192.168.2.154:3000" + target if target.startswith("/") else target
+                            break
+        except Exception as exc:
+            logger.warning("Failed to query CI run URL: %s", exc)
+
     text = render_template("ci_failure", {
         "repo": repo,
         "pr_number": str(issue_number),
         "branch": branch,
         "error_summary": error_summary,
+        "ci_url": ci_url,
     })
 
     title = f"CI 失败: {repo}#{issue_number}"

templates/toolchain/ci_failure.md

@@ -7,3 +7,5 @@ PR: http://192.168.2.154:3000/{repo}/pulls/{pr_number}
 {error_summary}
 
 请检查 CI 日志并修复。修复后 push 会自动触发 CI。
+
+CI 日志链接: {ci_url}