M3 Registrierung und Login-Grundlage ergänzen

- SaaS-Auth-Helper und PDO-Datenbankzugriff einführen
- Registrierung, Login, Logout und Kontoansicht ergänzen
- Auth-Migration, Flow-Check und Smoke-Abdeckung aktualisieren

database/migrations/0003_saas_auth_account_fields.sql

@@ -0,0 +1,86 @@
+SET @schema_name = DATABASE();
+
+SET @sql = (
+  SELECT IF(
+    EXISTS (
+      SELECT 1
+      FROM INFORMATION_SCHEMA.COLUMNS
+      WHERE TABLE_SCHEMA = @schema_name
+        AND TABLE_NAME = 'users'
+        AND COLUMN_NAME = 'email_verified_at'
+    ),
+    'SELECT 1',
+    'ALTER TABLE users ADD COLUMN email_verified_at DATETIME NULL AFTER status'
+  )
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+SET @sql = (
+  SELECT IF(
+    EXISTS (
+      SELECT 1
+      FROM INFORMATION_SCHEMA.COLUMNS
+      WHERE TABLE_SCHEMA = @schema_name
+        AND TABLE_NAME = 'users'
+        AND COLUMN_NAME = 'mfa_enabled'
+    ),
+    'SELECT 1',
+    'ALTER TABLE users ADD COLUMN mfa_enabled TINYINT(1) NOT NULL DEFAULT 0 AFTER email_verified_at'
+  )
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+SET @sql = (
+  SELECT IF(
+    EXISTS (
+      SELECT 1
+      FROM INFORMATION_SCHEMA.COLUMNS
+      WHERE TABLE_SCHEMA = @schema_name
+        AND TABLE_NAME = 'users'
+        AND COLUMN_NAME = 'disabled_at'
+    ),
+    'SELECT 1',
+    'ALTER TABLE users ADD COLUMN disabled_at DATETIME NULL AFTER mfa_enabled'
+  )
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+SET @sql = (
+  SELECT IF(
+    EXISTS (
+      SELECT 1
+      FROM INFORMATION_SCHEMA.STATISTICS
+      WHERE TABLE_SCHEMA = @schema_name
+        AND TABLE_NAME = 'participants'
+        AND INDEX_NAME = 'uq_participants_tenant_user'
+    ),
+    'SELECT 1',
+    'ALTER TABLE participants ADD UNIQUE KEY uq_participants_tenant_user (tenant_id, user_id)'
+  )
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+SET @sql = (
+  SELECT IF(
+    EXISTS (
+      SELECT 1
+      FROM INFORMATION_SCHEMA.STATISTICS
+      WHERE TABLE_SCHEMA = @schema_name
+        AND TABLE_NAME = 'participants'
+        AND INDEX_NAME = 'idx_participants_tenant_paypal_name'
+    ),
+    'SELECT 1',
+    'ALTER TABLE participants ADD KEY idx_participants_tenant_paypal_name (tenant_id, paypal_name)'
+  )
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;