fix(auth): persist current_year when creating a student account

[anshul23102]

Related Issue

Closes #277

Problem

The student signup path validated current_year (range 1 to 6) but the field was absent from the student_bio object passed to User.create:

student_bio: {
    gender: req.body.gender || 'male',
    enrollment_year: req.body.enrollment_year || new Date().getFullYear(),
    course: course_id,
    roll_number: req.body.roll_number || null,
    avatar: ''
    // current_year is missing
}

Every student account was stored with current_year as undefined in the database even though the client submitted a valid value and the studentBioSchema includes the field.

Fix

Added current_year: Number(req.body.current_year) to the student_bio object. Number() is used for consistency with the numeric type expected by the schema.

Files Changed

File	Change
backend/controllers/auth.controller.js	Add current_year field to student_bio in User.create

Testing

• POST signup with userType: student, current_year: 3. The saved document has student_bio.current_year === 3.
• The login response already included current_year in the student_bio payload, so frontend consumers will now receive the correct value.

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