Address review: rename timeout constant, fix incomplete docs URL

Agent-Logs-Url: https://github.com/thaitien280401-stack/RedditVideoMakerBot/sessions/adc9d93e-b8a2-4b45-8f6c-50427edeee51

Co-authored-by: thaitien280401-stack <271128961+thaitien280401-stack@users.noreply.github.com>

main.py

@@ -301,7 +301,7 @@ if __name__ == "__main__":
                 f"Lỗi: {err}\n\n"
                 "Hướng dẫn khắc phục:\n"
                 "1. Kiểm tra access_token trong config.toml còn hiệu lực không\n"
-                "2. Lấy token mới tại: https://developers.facebook.com/docs/threads\n"
+                "2. Lấy token mới tại: https://developers.facebook.com/docs/threads/get-started\n"
                 "3. Đảm bảo token có quyền: threads_basic_read\n"
                 "4. Kiểm tra user_id khớp với tài khoản Threads"
             )

utils/check_token.py

@@ -25,7 +25,7 @@ from utils import settings
 from utils.console import print_step, print_substep
 
 THREADS_API_BASE = "https://graph.threads.net/v1.0"
-_REQUEST_TIMEOUT = 15  # seconds – preflight should be fast
+_REQUEST_TIMEOUT_SECONDS = 15  # preflight should be fast
 
 
 class TokenCheckError(Exception):
@@ -39,7 +39,7 @@ def _call_me_endpoint(access_token: str) -> dict:
         "fields": "id,username",
         "access_token": access_token,
     }
-    response = requests.get(url, params=params, timeout=_REQUEST_TIMEOUT)
+    response = requests.get(url, params=params, timeout=_REQUEST_TIMEOUT_SECONDS)
 
     # HTTP-level errors
     if response.status_code == 401:
@@ -79,7 +79,7 @@ def _try_refresh(access_token: str) -> Optional[str]:
                 "grant_type": "th_refresh_token",
                 "access_token": access_token,
             },
-            timeout=_REQUEST_TIMEOUT,
+            timeout=_REQUEST_TIMEOUT_SECONDS,
         )
         resp.raise_for_status()
         data = resp.json()