add setup wizard, lockdown, team tasks, embed builder; fix admin dashboard

Four new independent features: /setup (guided onboarding wizard for
module/channel/automod-strength config), /lockdown (raid protection with
per-channel permission snapshot/restore and join-kick), /task (staff task
tracker with status buttons + dashboard view), /embed create (modal-driven
embed builder with optional link button). Also fixes the Admin dashboard,
which always showed "-" because loadAdminData() double-wrapped the overview
response and discarded activity data, plus mismatched field names against
adminService's actual shape (guildCount/activeGuilds24/uptimeMs).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/services/taskService.ts

@@ -0,0 +1,38 @@
+import { prisma } from '../database';
+
+export type TaskStatus = 'open' | 'in_progress' | 'done';
+
+export class TaskService {
+  public async createTask(data: {
+    guildId: string;
+    title: string;
+    description?: string;
+    assigneeId?: string;
+    createdBy: string;
+    createdByTag: string;
+  }) {
+    return prisma.staffTask.create({ data });
+  }
+
+  public async listTasks(guildId: string, status?: string) {
+    return prisma.staffTask.findMany({
+      where: { guildId, ...(status ? { status } : {}) },
+      orderBy: { createdAt: 'desc' }
+    });
+  }
+
+  public async getTask(id: string) {
+    return prisma.staffTask.findUnique({ where: { id } });
+  }
+
+  public async updateStatus(id: string, status: TaskStatus) {
+    return prisma.staffTask.update({ where: { id }, data: { status } });
+  }
+
+  public async deleteTask(guildId: string, id: string) {
+    const task = await prisma.staffTask.findFirst({ where: { id, guildId } });
+    if (!task) return false;
+    await prisma.staffTask.delete({ where: { id } });
+    return true;
+  }
+}