refactor: move raw SQL out of views into config/functions_db.php

Auditoria 6.3 apontava dashboard.php (2×), user/index.php e
user/profile.php como as únicas vistas com SQL direto, quebrando a
convenção da frota (config/functions_*.php como camada de models). As
quatro passam a chamar db_users_count_clients(), db_users_count_team(),
db_users_list() e db_user_update_profile() — mesmo SQL, mesmos
parâmetros, só movido para onde o resto do código já vai buscar dados.

Nota: views/admin/gyms/{create,edit}.php e views/admin/reviews/index.php
também têm SQL direto, mas não estavam no âmbito dos "3 vistas" da
auditoria (entraram depois, no trabalho de multi-ginásio) — por tratar
numa próxima passagem.

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

views/admin/dashboard.php

@@ -5,8 +5,8 @@ $user = require_admin();
 
 // Counts for the dashboard widgets.
 $counts = [
-    'clientes' => (int) $pdo->query("SELECT COUNT(*) FROM users WHERE role = 'client'")->fetchColumn(),
-    'equipa'   => (int) $pdo->query("SELECT COUNT(*) FROM users WHERE role IN ('admin','staff')")->fetchColumn(),
+    'clientes' => db_users_count_clients($pdo),
+    'equipa'   => db_users_count_team($pdo),
     'leads_novos' => db_membership_leads_count_new($pdo),
 ];
 

views/user/index.php

@@ -3,10 +3,7 @@ require __DIR__ . '/../../config/db.php';
 require __DIR__ . '/../../config/functions.php';
 $user = require_admin();
 
-$users = $pdo->query(
-    "SELECT id, name, email, phone, role, is_active, password_hash, last_login_at, last_login_ua
-     FROM users ORDER BY FIELD(role,'sysadmin','admin','staff','client'), name"
-)->fetchAll(PDO::FETCH_ASSOC);
+$users = db_users_list($pdo);
 
 include __DIR__ . '/../../includes/header.php';
 ?>

views/user/profile.php

@@ -42,11 +42,10 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         $sms_opt      = isset($_POST['sms_opt_out']) ? 1 : 0;
         $marketing    = isset($_POST['marketing_consent']) ? 1 : 0;
         $before = db_get_user($pdo, (int) $user['id']) ?? [];
-        $pdo->prepare(
-            "UPDATE users SET phone=?, address=?, city=?, postal_code=?,
-                              email_opt_out=?, sms_opt_out=?, marketing_consent=?
-             WHERE id=?"
-        )->execute([$phone, $address, $city, $postal_code, $email_opt, $sms_opt, $marketing, $user['id']]);
+        db_user_update_profile($pdo, (int) $user['id'], [
+            'phone' => $phone, 'address' => $address, 'city' => $city, 'postal_code' => $postal_code,
+            'email_opt_out' => $email_opt, 'sms_opt_out' => $sms_opt, 'marketing_consent' => $marketing,
+        ]);
         audit('user.profile_update', [
             'target_type' => 'user', 'target_id' => (int) $user['id'], 'target_label' => (string) $user['name'],
             'changes' => platform_audit_diff(