[FIX] website_membership_registration: Added active and case insensitive checks for mail_uniqueness

[ByteMeAsap]

No description provided.

[Copilot]

Pull request overview

Updates the member email uniqueness constraint in website_membership_registration to avoid false matches and to only consider active member records when checking for duplicates.

Changes:

• Switches the duplicate-email SQL check from ILIKE pattern matching to case-insensitive equality via LOWER(email) = LOWER(%s).
• Restricts the duplicate-email check to active partners (active = TRUE).

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[Copilot]

The SQL now filters duplicates to active = TRUE, but the constraint is only declared on email and membership_state. If a user archives/unarchives a partner (toggles active), this constraint won't run, which can allow creating two active members with the same email after reactivation. Include active in the @api.constrains(...) fields (or enforce uniqueness regardless of active) so activation changes also trigger the check.