fix ValueError when API returns error response for repo languages

Handle cases where the Gitea API returns an error message (e.g., "token
scope is limited to public repos") instead of language data. Now skips
repos with non-OK responses or error messages gracefully.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/language_stats.py

@@ -142,12 +142,26 @@ def aggregate_language_bytes(session: requests.Session, repos: list[dict]) -> di
     totals: dict[str, int] = defaultdict(int)
 
     for repo in repos:
-        langs = session.get(
+        resp = session.get(
             f"{BASE_URL}/api/v1/repos/{USERNAME}/{repo['name']}/languages",
             timeout=30,
-        ).json()
+        )
+        if not resp.ok:
+            # Skip repos we can't access (e.g., token scope limitations)
+            print(f"Warning: Could not fetch languages for {repo['name']}: {resp.status_code}", file=sys.stderr)
+            continue
+        langs = resp.json()
+        # Skip error responses (e.g., {"message": "..."})
+        if not isinstance(langs, dict) or "message" in langs:
+            print(f"Warning: Unexpected response for {repo['name']}: {langs}", file=sys.stderr)
+            continue
         for lang, bytes_ in langs.items():
-            totals[lang] += int(bytes_)
+            # Handle bytes as either int or string
+            if isinstance(bytes_, int):
+                totals[lang] += bytes_
+            elif isinstance(bytes_, str) and bytes_.isdigit():
+                totals[lang] += int(bytes_)
+            # Skip non-numeric values
 
     return dict(totals)