Migrate remaining encrypted-column lookups to the blind index

Completes the set of queries that matched a freshly encrypted value against a
stored one, which only works while encryption is deterministic. Each keeps its
original comparison and adds an index comparison in the same WHERE, so nothing
changes today.

- passenger sign-in by email, service-staff sign-in, Firebase token lookup
- driver lookup by phone and by national number
- admin ride lookup and ride monitor (both tables)
- nabeh: driver status, user resolution, ride history, complaint submission

transit_org_admins lives in the transit database and has no index column, so
login there falls back to decrypting the small set of active admins and
comparing normalised numbers.

Schema: adds users.email_bidx/phone_bidx and driver.national_bidx with their
indexes.

Verified that every :*_bidx placeholder introduced is actually bound — an
unbound one is a fatal error at request time, not a silent miss.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

backend/serviceapp/getDriverByNational.php

@@ -5,7 +5,9 @@ require_once __DIR__ . '/../connect.php';
 $national_number = filterRequest("national_number");
 
 // 2. تشفير الرقم الوطني للمقارنة مع القيمة المشفرة في قاعدة البيانات
-$encryptedNationalNumber = $encryptionHelper->encryptData($national_number); 
+$encryptedNationalNumber = $encryptionHelper->encryptData($national_number);
+global $blindIndex;
+$nationalBidx = $blindIndex ? $blindIndex->index('driver.national', $national_number) : null; 
 
 $sql = "SELECT
     COALESCE(
@@ -73,13 +75,14 @@ $sql = "SELECT
     d.*
 FROM driver d
 LEFT JOIN CarRegistration cr ON cr.driverID = d.id
-WHERE d.national_number = :national_number; 
+WHERE d.national_number = :national_number OR (:national_bidx IS NOT NULL AND d.national_bidx = :national_bidx); 
 "; 
 // 3. تم تعديل الشرط أعلاه للبحث بالرقم الوطني
 
 $stmt = $con->prepare($sql);
 // 4. ربط الباراميتر الجديد
 $stmt->bindParam(':national_number', $encryptedNationalNumber);
+$stmt->bindParam(':national_bidx', $nationalBidx);
 $stmt->execute();
 
 if ($stmt->rowCount() > 0) {