implemented peewee query for term instead of cache

[MImran2002]

Issue Description

Fixes issue #HotFix

• Fixed an issue where outdated current-term data remained in the user's cookies/session after the database was reset.
• Previously, even after resetting the database and restarting Flask, the old term information could still appear until the browser cookies were cleared manually.
• So this causes either the handbook to disappear or still appear.

Changes

• Changed g.current_term to retrieve the current term directly from the database using the term ID stored in the session.
• Replaced:
  dict_to_model(Term, session['current_term'])
  with:
  Term.get_by_id(session["current_term"])
• This prevents term model data from being reused from the session and ensures the application loads the current database term record.

Testing

• Navigate to Admin → Settings → Term Management.
• Upload the required handbook and confirm the information appears correctly.
• Reset the database.
• Restart the application using flask run.
• Refresh the browser without clearing cookies.
• Confirm that the old information no longer remains after the database reset.
• Verified that manually clearing browser cookies is no longer required for the information to update correctly.