Add traffic limit functionality

- Add traffic_limit field to vpn_clients table (migration 007)
- Add traffic limit management methods in VpnClient class
- Add API endpoints: set-traffic-limit, traffic-limit-status, overlimit
- Add UI for setting limits when creating clients
- Add traffic limit column in clients table with visual indicators
- Add automatic traffic limit check via cron (bin/check_traffic_limits.php)
- Add translations for traffic limits (6 languages)
- Update README with traffic limit documentation

migrations/001_init.sql

@@ -205,6 +205,9 @@ INSERT INTO translations (language_code, translation_key, translation_value) VAL
 ('en', 'clients.sync_stats', 'Sync Stats'),
 ('en', 'clients.title', 'Clients'),
 ('en', 'clients.traffic', 'Traffic'),
+('en', 'clients.traffic_limit', 'Traffic Limit'),
+('en', 'clients.unlimited', 'Unlimited'),
+('en', 'clients.overlimit', 'Over Limit'),
 ('en', 'backups.title', 'Server Backups'),
 ('en', 'backups.create', 'Create Backup'),
 ('en', 'backups.restore', 'Restore'),

migrations/002_translations_ru.sql

@@ -1,5 +1,5 @@
--- Russian translations
--- This migration adds Russian language translations
+-- RU translations
+-- This migration adds RU language translations
 
 INSERT INTO translations (language_code, translation_key, translation_value) VALUES
 ('ru', 'auth.email', 'Email'),
@@ -32,6 +32,7 @@ INSERT INTO translations (language_code, translation_key, translation_value) VAL
 ('ru', 'clients.never', 'Никогда'),
 ('ru', 'clients.never_expires', 'Бессрочно'),
 ('ru', 'clients.no_clients', 'Пока нет клиентов'),
+('ru', 'clients.overlimit', 'Превышен лимит'),
 ('ru', 'clients.qr_code', 'QR-код'),
 ('ru', 'clients.received', 'Получено'),
 ('ru', 'clients.restore', 'Восстановить'),
@@ -43,6 +44,8 @@ INSERT INTO translations (language_code, translation_key, translation_value) VAL
 ('ru', 'clients.sync_stats', 'Синхронизировать статистику'),
 ('ru', 'clients.title', 'Клиенты'),
 ('ru', 'clients.traffic', 'Трафик'),
+('ru', 'clients.traffic_limit', 'Лимит трафика'),
+('ru', 'clients.unlimited', 'Безлимитно'),
 ('ru', 'common.days', 'дней'),
 ('ru', 'dashboard.active_clients', 'Активные клиенты'),
 ('ru', 'dashboard.add_first_server', 'Добавить первый сервер'),

migrations/003_translations_es.sql

@@ -1,5 +1,5 @@
--- Spanish translations
--- This migration adds Spanish language translations
+-- ES translations
+-- This migration adds ES language translations
 
 INSERT INTO translations (language_code, translation_key, translation_value) VALUES
 ('es', 'auth.email', 'Correo electrónico'),
@@ -32,6 +32,7 @@ INSERT INTO translations (language_code, translation_key, translation_value) VAL
 ('es', 'clients.never', 'Nunca'),
 ('es', 'clients.never_expires', 'Nunca vence'),
 ('es', 'clients.no_clients', 'Aún no hay clientes'),
+('es', 'clients.overlimit', 'Límite excedido'),
 ('es', 'clients.qr_code', 'Código QR'),
 ('es', 'clients.received', 'Recibido'),
 ('es', 'clients.restore', 'Restaurar'),
@@ -43,6 +44,8 @@ INSERT INTO translations (language_code, translation_key, translation_value) VAL
 ('es', 'clients.sync_stats', 'Sincronizar estadísticas'),
 ('es', 'clients.title', 'Clientes'),
 ('es', 'clients.traffic', 'Tráfico'),
+('es', 'clients.traffic_limit', 'Límite de tráfico'),
+('es', 'clients.unlimited', 'Ilimitado'),
 ('es', 'common.days', 'días'),
 ('es', 'dashboard.active_clients', 'Clientes activos'),
 ('es', 'dashboard.add_first_server', 'Agregar primer servidor'),

migrations/004_translations_de.sql

@@ -1,5 +1,5 @@
--- German translations
--- This migration adds German language translations
+-- DE translations
+-- This migration adds DE language translations
 
 INSERT INTO translations (language_code, translation_key, translation_value) VALUES
 ('de', 'auth.email', 'E-Mail'),
@@ -32,6 +32,7 @@ INSERT INTO translations (language_code, translation_key, translation_value) VAL
 ('de', 'clients.never', 'Niemals'),
 ('de', 'clients.never_expires', 'Läuft nie ab'),
 ('de', 'clients.no_clients', 'Noch keine Kunden'),
+('de', 'clients.overlimit', 'Limit überschritten'),
 ('de', 'clients.qr_code', 'QR-Code'),
 ('de', 'clients.received', 'Empfangen'),
 ('de', 'clients.restore', 'Wiederherstellen'),
@@ -43,6 +44,8 @@ INSERT INTO translations (language_code, translation_key, translation_value) VAL
 ('de', 'clients.sync_stats', 'Statistiken synchronisieren'),
 ('de', 'clients.title', 'Clients'),
 ('de', 'clients.traffic', 'Datenverkehr'),
+('de', 'clients.traffic_limit', 'Traffic-Limit'),
+('de', 'clients.unlimited', 'Unbegrenzt'),
 ('de', 'common.days', 'Tage'),
 ('de', 'dashboard.active_clients', 'Aktive Clients'),
 ('de', 'dashboard.add_first_server', 'Ersten Server hinzufügen'),

migrations/005_translations_fr.sql

@@ -1,5 +1,5 @@
--- French translations
--- This migration adds French language translations
+-- FR translations
+-- This migration adds FR language translations
 
 INSERT INTO translations (language_code, translation_key, translation_value) VALUES
 ('fr', 'auth.email', 'Email'),
@@ -32,6 +32,7 @@ INSERT INTO translations (language_code, translation_key, translation_value) VAL
 ('fr', 'clients.never', 'Jamais'),
 ('fr', 'clients.never_expires', 'N''expire jamais'),
 ('fr', 'clients.no_clients', 'Pas encore de clients'),
+('fr', 'clients.overlimit', 'Limite dépassée'),
 ('fr', 'clients.qr_code', 'Code QR'),
 ('fr', 'clients.received', 'Reçu'),
 ('fr', 'clients.restore', 'Restaurer'),
@@ -43,6 +44,8 @@ INSERT INTO translations (language_code, translation_key, translation_value) VAL
 ('fr', 'clients.sync_stats', 'Synchroniser les statistiques'),
 ('fr', 'clients.title', 'Clients'),
 ('fr', 'clients.traffic', 'Trafic'),
+('fr', 'clients.traffic_limit', 'Limite de trafic'),
+('fr', 'clients.unlimited', 'Illimité'),
 ('fr', 'common.days', 'jours'),
 ('fr', 'dashboard.active_clients', 'Clients actifs'),
 ('fr', 'dashboard.add_first_server', 'Ajouter le premier serveur'),

migrations/006_translations_zh.sql

@@ -1,5 +1,5 @@
--- Chinese translations
--- This migration adds Chinese language translations
+-- ZH translations
+-- This migration adds ZH language translations
 
 INSERT INTO translations (language_code, translation_key, translation_value) VALUES
 ('zh', 'auth.email', '邮箱'),
@@ -32,6 +32,7 @@ INSERT INTO translations (language_code, translation_key, translation_value) VAL
 ('zh', 'clients.never', '从不'),
 ('zh', 'clients.never_expires', '永不过期'),
 ('zh', 'clients.no_clients', '还没有客户'),
+('zh', 'clients.overlimit', '超出限制'),
 ('zh', 'clients.qr_code', '二维码'),
 ('zh', 'clients.received', '已接收'),
 ('zh', 'clients.restore', '恢复'),
@@ -43,6 +44,8 @@ INSERT INTO translations (language_code, translation_key, translation_value) VAL
 ('zh', 'clients.sync_stats', '同步统计'),
 ('zh', 'clients.title', '客户端'),
 ('zh', 'clients.traffic', '流量'),
+('zh', 'clients.traffic_limit', '流量限制'),
+('zh', 'clients.unlimited', '无限制'),
 ('zh', 'common.days', '天'),
 ('zh', 'dashboard.active_clients', '活跃客户端'),
 ('zh', 'dashboard.add_first_server', '添加第一个服务器'),

migrations/007_add_traffic_limit.sql

@@ -0,0 +1,6 @@
+-- Add traffic limit field to vpn_clients table
+-- This migration adds traffic limit functionality to clients
+
+ALTER TABLE vpn_clients 
+ADD COLUMN traffic_limit BIGINT UNSIGNED NULL COMMENT 'Traffic limit in bytes (NULL = unlimited)' AFTER traffic_received,
+ADD INDEX idx_traffic_limit (traffic_limit);