fix: match newline characters and trim whitespace in prompt

Fixes a bug where only the first line of the prompt was matched,
so multi-line prompts are now recognized and handled properly.

Also fixes a bug where the first line being empty results in an empty prompt.

Signed-off-by: Edward Ly <[email protected]>

Author: edward-ly

src/main.py

@@ -33,7 +33,7 @@ async def lifespan(app: FastAPI):
 
 def ai_talk_bot_process_request(message: TalkBotMessage, nc: NextcloudApp):
     message_text = message.object_content["message"]
-    prompt = re.search(r"@assistant\s(.*)", message_text, re.IGNORECASE)
+    prompt = re.search(r"@assistant\s+(.*)\s*", message_text, re.IGNORECASE | re.DOTALL)
 
     if prompt is None:
         return