Build AI Chief of Staff MVP: auth, mailbox sync, briefings, draft replies

Scaffolds a Next.js app with email/password auth, encrypted IMAP/SMTP/CalDAV
mailbox connections, a background sync job, Claude-generated daily briefings,
and an approve-before-send draft reply flow. Includes a clean design system
(light/dark) and deployment config (systemd unit, credential rotation script).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012o9j9RezxbZVKQMrB7oRLY

src/app/api/drafts/generate/route.ts

@@ -0,0 +1,55 @@
+export const runtime = "nodejs";
+
+import { NextResponse } from "next/server";
+import { z } from "zod";
+import { and, eq } from "drizzle-orm";
+import { getCurrentSession } from "@/lib/auth/session";
+import { db } from "@/lib/db/client";
+import { emails, emailDrafts } from "@/lib/db/schema";
+import { generateDraftReply } from "@/lib/ai/draftReply";
+import { BRIEFING_MODEL } from "@/lib/ai/client";
+
+const bodySchema = z.object({ emailId: z.string().min(1) });
+
+export async function POST(request: Request) {
+  const session = await getCurrentSession();
+  if (!session) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  const parsed = bodySchema.safeParse(await request.json().catch(() => null));
+  if (!parsed.success) {
+    return NextResponse.json({ error: "Invalid input" }, { status: 400 });
+  }
+
+  const email = await db.query.emails.findFirst({
+    where: and(eq(emails.id, parsed.data.emailId), eq(emails.userId, session.user.id)),
+  });
+  if (!email) {
+    return NextResponse.json({ error: "Email not found" }, { status: 404 });
+  }
+
+  try {
+    const draft = await generateDraftReply({
+      from: email.fromAddress,
+      subject: email.subject,
+      bodyText: email.bodyText ?? email.snippet ?? "",
+    });
+
+    const [row] = await db
+      .insert(emailDrafts)
+      .values({
+        userId: session.user.id,
+        sourceEmailId: email.id,
+        generatedSubject: draft.subject,
+        generatedBody: draft.body,
+        modelUsed: BRIEFING_MODEL,
+      })
+      .returning();
+
+    return NextResponse.json({ draft: row });
+  } catch (err) {
+    const message = err instanceof Error ? err.message : String(err);
+    return NextResponse.json({ error: message }, { status: 500 });
+  }
+}