feat(admin-ui): members panel, invite links, audit tab and role-aware console

- New MembersPanel: role switching, add/remove members, invite-link
  generation with copy/revoke, pending invite list
- New Audit tab (AuditLog.vue) with group filter
- Role-aware UI: viewer hides route/group edit actions (RouteCard readonly),
  owner-only controls, role badge + member count on group cards
- GroupEditor: members managed via panel, owners field super-admin only
- en/zh i18n and CSS for the new panels

admin/types.ts

@@ -25,15 +25,45 @@ export interface Route {
   discordRoleIds?: string[];
 }
 
+export type GroupRole = "owner" | "admin" | "viewer";
+
+export interface GroupMember {
+  login: string;
+  role: GroupRole;
+}
+
 export interface Group {
   id: string;
   name: string;
   adminIds: string[];
+  members?: GroupMember[];
   owners?: string[];
   providers?: ("github" | "gitea" | "gitlab")[];
   emoji?: boolean;
 }
 
+export interface GroupInvite {
+  token: string;
+  groupId: string;
+  role: "admin" | "viewer";
+  expiresAt: number;
+  createdBy: string;
+  note?: string;
+}
+
+export interface AuditEntry {
+  id?: number;
+  ts: number;
+  actorId?: string;
+  actorLogin?: string;
+  action: string;
+  targetType?: string;
+  targetId?: string;
+  groupId?: string;
+  detail?: Record<string, unknown>;
+  ip?: string;
+}
+
 export interface RouteTemplate {
   id: string;
   nameKey: string;