refactor: improve code formatting and readability in configuration and run files

- Simplified the assignment of `bot_username` in `config.py` for better clarity.
- Removed redundant import statement in `run.py` to streamline the code.
- Enhanced formatting in `group_duty_pin.py` and test files for improved readability and consistency.
- No functional changes were made; the focus was on code style and organization.

duty_teller/config.py

@@ -94,9 +94,7 @@ class Settings:
         )
         raw_host = (os.getenv("HTTP_HOST") or "127.0.0.1").strip()
         http_host = raw_host if raw_host else "127.0.0.1"
-        bot_username = (
-            (os.getenv("BOT_USERNAME", "") or "").strip().lstrip("@").lower()
-        )
+        bot_username = (os.getenv("BOT_USERNAME", "") or "").strip().lstrip("@").lower()
         return cls(
             bot_token=bot_token,
             database_url=os.getenv("DATABASE_URL", "sqlite:///data/duty_teller.db"),

duty_teller/handlers/group_duty_pin.py

@@ -439,7 +439,9 @@ async def trust_group_cmd(update: Update, context: ContextTypes.DEFAULT_TYPE) ->
     loop = asyncio.get_running_loop()
     already_trusted = await loop.run_in_executor(
         None,
-        lambda: _sync_trust_group(chat_id, update.effective_user.id if update.effective_user else None),
+        lambda: _sync_trust_group(
+            chat_id, update.effective_user.id if update.effective_user else None
+        ),
     )
     if already_trusted:
         await update.message.reply_text(t(lang, "trust_group.already_trusted"))

duty_teller/run.py

@@ -11,6 +11,7 @@ from telegram.ext import ApplicationBuilder
 from duty_teller import config
 from duty_teller.config import require_bot_token
 from duty_teller.handlers import group_duty_pin, register_handlers
+from duty_teller.utils.http_client import safe_urlopen
 
 
 async def _resolve_bot_username(application) -> None:
@@ -19,7 +20,7 @@ async def _resolve_bot_username(application) -> None:
         me = await application.bot.get_me()
         config.BOT_USERNAME = (me.username or "").lower()
         logger.info("Resolved BOT_USERNAME from API: %s", config.BOT_USERNAME)
-from duty_teller.utils.http_client import safe_urlopen
+
 
 logging.basicConfig(
     format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",