feat: P1 Calendar — CalendarView (month/week/list, drag&drop, channel filter)

app/api/calendar/route.js

@@ -0,0 +1,40 @@
+import { NextResponse } from 'next/server';
+import { requireUser } from '@/lib/session';
+import { engine } from '@/lib/engine';
+
+// GET /api/calendar?from=&to=&channel_id=
+export async function GET(request) {
+  const user = await requireUser();
+  if (!user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
+
+  const { searchParams } = new URL(request.url);
+  const params = {};
+  if (searchParams.get('from'))       params.from       = searchParams.get('from');
+  if (searchParams.get('to'))         params.to         = searchParams.get('to');
+  if (searchParams.get('channel_id')) params.channel_id = searchParams.get('channel_id');
+
+  try {
+    const data = await engine.getCalendar(user.id, params);
+    return NextResponse.json(data);
+  } catch (err) {
+    return NextResponse.json({ error: err.message }, { status: err.status || 500 });
+  }
+}
+
+// PATCH /api/calendar — reschedule user_post (drag & drop)
+export async function PATCH(request) {
+  const user = await requireUser();
+  if (!user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
+
+  const { id, scheduled_at } = await request.json();
+  if (!id || !scheduled_at) {
+    return NextResponse.json({ error: 'id and scheduled_at required' }, { status: 400 });
+  }
+
+  try {
+    const post = await engine.updatePost(user.id, id, { scheduled_at, status: 'scheduled' });
+    return NextResponse.json(post);
+  } catch (err) {
+    return NextResponse.json({ error: err.message }, { status: err.status || 500 });
+  }
+}