[taskboard] migrate fleet console to nextjs

app/api/tasks/route.ts

@@ -0,0 +1,26 @@
+import { NextResponse } from "next/server";
+
+import { createTask, listTasks, validateTaskPayload } from "@/lib/tasks";
+
+export async function GET() {
+  return NextResponse.json(await listTasks());
+}
+
+export async function POST(request: Request) {
+  const payload = (await request.json()) as Record<string, unknown>;
+  const errors = validateTaskPayload(payload as never, false);
+  if (errors.length > 0) {
+    return NextResponse.json({ error: "validation_error", details: errors }, { status: 400 });
+  }
+
+  const task = await createTask({
+    title: String(payload.title),
+    description: typeof payload.description === "string" ? payload.description : "",
+    assignee: typeof payload.assignee === "string" ? payload.assignee : "",
+    priority: payload.priority as never,
+    status: (payload.status as never) || "Backlog",
+    tags: Array.isArray(payload.tags) ? payload.tags.filter((tag) => typeof tag === "string") : [],
+  });
+
+  return NextResponse.json(task, { status: 201 });
+}