feat: enhance user management and system optimization

New Features:
- Add bulk ban and email notification in user management
- Add CSV export for batch coupon generation
- Optimize subscription description template

Bug Fixes:
- Fix knowledge base pagination issue
- Fix permission group filtering in node management
- Fix unauthorized order placement for free subscription periods

resources/lang/en-US.json

@@ -113,5 +113,11 @@
     "QR Code": "QR Code",
     "Unlimited": "Unlimited",
     "Device Limit": "Device Limit",
-    "Devices": "Devices"
+    "Devices": "Devices",
+    "No Limit": "No Limit",
+    "First Day of Month": "First Day of Month",
+    "Monthly": "Monthly",
+    "Never": "Never",
+    "First Day of Year": "First Day of Year",
+    "Yearly": "Yearly"
 }

resources/lang/zh-CN.json

@@ -113,5 +113,11 @@
     "QR Code": "二维码",
     "Unlimited": "长期有效",
     "Device Limit": "设备限制",
-    "Devices": "台设备"
+    "Devices": "台设备",
+    "No Limit": "不限制",
+    "First Day of Month": "每月1号",
+    "Monthly": "按月",
+    "Never": "不重置",
+    "First Day of Year": "每年1月1日",
+    "Yearly": "按年"
 }

resources/lang/zh-TW.json

@@ -113,5 +113,11 @@
     "QR Code": "二維碼",
     "Unlimited": "長期有效",
     "Device Limit": "設備限制",
-    "Devices": "台設備"
+    "Devices": "台設備",
+    "No Limit": "不限制",
+    "First Day of Month": "每月1號",
+    "Monthly": "按月",
+    "Never": "不重置",
+    "First Day of Year": "每年1月1日",
+    "Yearly": "按年"
 }