`register.php` full updated premium code. Existing file me username auto-generate, duplicate check, email send logic tha; same logic ko modern UI + fixed JS validation ke sath update kiya. ```php API Portal - Sign Up

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API Portal API Portal Account Create

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Secure SignupDuplicate mobile/email check enabled
Auto UsernameMobile se username auto generate
Email AlertRegistration details email par jayega
Password me letter, number aur special character hona chahiye.
Password match check
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