fix(api): cap weekly gitea stats readback

apps/api/src/services/weekly_report_service.py

@@ -162,12 +162,14 @@ class WeeklyReportService:
         deploys = 0
         page = 1
         limit = 50
+        max_pages = 4
         try:
             for api_url in self._gitea_api_candidates():
                 commits = deploys = 0
                 page = 1
+                total_commits: int | None = None
                 try:
-                    while page <= 20:
+                    while page <= max_pages:
                         query = urlencode({
                             "sha": "main",
                             "since": since_utc,
@@ -177,6 +179,9 @@ class WeeklyReportService:
                         url = f"{api_url}/api/v1/repos/{owner}/{repo}/commits?{query}"
                         request = Request(url, headers=headers)
                         with urlopen(request, timeout=3) as response:
+                            total_header = response.headers.get("X-Total-Count") or response.headers.get("X-Total")
+                            if total_header and total_header.isdigit():
+                                total_commits = int(total_header)
                             payload = json.loads(response.read().decode("utf-8"))
                         if not isinstance(payload, list):
                             logger.warning("gitea_git_stats_unexpected_payload", payload_type=type(payload).__name__)
@@ -189,8 +194,16 @@ class WeeklyReportService:
                             if "deploy" in subject or subject.startswith("chore(cd):"):
                                 deploys += 1
                         if len(payload) < limit:
-                            return commits, deploys, True
+                            return total_commits or commits, deploys, True
                         page += 1
+                    if total_commits is not None and total_commits > 0:
+                        logger.info(
+                            "gitea_git_stats_sampled",
+                            total_commits=total_commits,
+                            sampled_pages=max_pages,
+                            sampled_deploys=deploys,
+                        )
+                        return total_commits, deploys, True
                 except Exception as candidate_exc:
                     logger.warning(
                         "gitea_git_stats_candidate_failed",