Apply ruff linting fixes and add pytest-asyncio

- Add pytest-asyncio to dev-reqs.txt for async test support
- Fix ruff formatting issues in symbol_router.py
- Fix ruff formatting issues in D_info.py and T_info.py
- Remove unused imports from test files (fixed by ruff --fix)
- Minor code style fixes in bot files

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

telegram/T_info.py

@@ -1,5 +1,4 @@
-"""Functions and Info specific to the Telegram Bot
-"""
+"""Functions and Info specific to the Telegram Bot"""
 
 import re
 

telegram/bot.py

@@ -232,7 +232,7 @@ def generate_options_reply(options_data: dict):
     message_text += pricing_info
 
     # Volume and open interest
-    volume_info = f"*Open Interest:* `{options_data['Open Interest']}`\n" f"*Volume:* `{options_data['Volume']}`\n\n"
+    volume_info = f"*Open Interest:* `{options_data['Open Interest']}`\n*Volume:* `{options_data['Volume']}`\n\n"
     message_text += volume_info
 
     # Greeks