Remove unused email libraries and add requirements file for project dependencies

main.py

@@ -1,13 +1,10 @@
 import json
 import os
 import dotenv
-from email.mime.text import MIMEText
-from email.mime.multipart import MIMEMultipart
 from email.mime.base import MIMEBase
 from email import encoders
 import sib_api_v3_sdk
 from sib_api_v3_sdk.rest import ApiException
-
 from summarize_paper import summarize_paper
 from fetch_data import fetch_paper_data_with_category
 from post_blog import post_blog

requirements.txt

@@ -0,0 +1,7 @@
+gradio==5.9.1
+gradio-client==1.5.2
+python-dotenv==1.0.1
+sib-api-v3-sdk==7.6.0
+mistune==3.0.2
+nbconvert==7.16.4
+requests==2.32.3