feat(i18n, agents): enhance multi-language support with new agent-related translations

Added new translations for agent management features in English, Nepali, and Chinese, including terms related to sub-agents, player management, and validation messages. This update improves the user experience by ensuring consistent terminology across different languages in the agents console.

src/i18n/locales/en/agents.json

@@ -37,6 +37,11 @@
   "loadFailed": "Failed to load agent tree",
   "siteLabel": "Site",
   "createChild": "Add child agent",
+  "viewDownline": "View sub-agents and players",
+  "downlineDialogTitle": "{{name}} — sub-agents and players",
+  "downlineAgentsSection": "Sub-agents",
+  "downlinePlayersSection": "Direct players",
+  "downlineNoAgents": "No sub-agents yet",
   "editNode": "Edit node",
   "deleteNode": "Delete node",
   "deleteNodeConfirm": "This action cannot be undone. Make sure the node has no children, users, or roles.",
@@ -59,6 +64,12 @@
   "deleteSuccess": "Deleted agent {{name}}",
   "saveFailed": "Save failed",
   "codeRequired": "Code and name are required",
+  "nameRequired": "Agent name is required",
+  "usernameRequired": "Login name is required",
+  "passwordRequired": "Password is required",
+  "passwordMinLength": "Password must be at least 8 characters",
+  "bindAccountPasswordRequired": "This agent has no login account yet. Enter an initial password to create one.",
+  "bindAccountHint": "No login account is bound yet. Saving will create and bind one automatically.",
   "modelGuide": "Agent layer controls data scope and delegation ceiling. Account permissions are assigned through roles.",
   "pageGuide": "Manage the agent tree, agent roles, agent accounts, and delegation ceilings here. Platform accounts and platform roles stay in platform governance pages.",
   "summary": {
@@ -83,7 +94,17 @@
     "canCreateChildAgent": "Allow creating sub-agents",
     "cycleDaily": "Daily",
     "cycleWeekly": "Weekly",
-    "cycleMonthly": "Monthly"
+    "cycleMonthly": "Monthly",
+    "loading": "Loading share and credit settings…",
+    "loadFailed": "Failed to load share and credit settings. Close and try again.",
+    "loadingBlocked": "Share and credit settings are still loading. Please wait before saving.",
+    "validation": {
+      "shareRange": "Share rate must be between 0 and 100",
+      "creditInvalid": "Credit limit cannot be negative",
+      "rebateLimitRange": "Rebate ceiling must be between 0 and 1 (e.g. 0.005 = 0.5%)",
+      "defaultRebateRange": "Default player rebate must be between 0 and 1",
+      "defaultExceedsLimit": "Default player rebate cannot exceed the rebate ceiling"
+    }
   },
   "settlementBills": {
     "title": "Agent bills",