Initial commit: DrinkTracker full-stack app

Next.js 14 drink collection tracker with AI-powered search,
menu scanning, ratings, wishlist, sharing, and CSV backup/restore.

Features:
- Auth (credentials + OAuth ready)
- Drink collection with ratings and reviews
- AI search via Claude/OpenAI with search history
- Menu photo scanning with AI extraction
- Wishlist / Try Later system
- Public sharing via slug URLs
- CSV backup and restore (merge/replace modes)
- Docker Compose for Postgres + MinIO + dev server

Security: docker-compose files use env var interpolation
instead of hardcoded secrets.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/api/settings/backup/route.ts

@@ -0,0 +1,60 @@
+import { auth } from "@/lib/auth"
+import { prisma } from "@/lib/prisma"
+import { generateBackupCsv } from "@/lib/backup"
+import { NextResponse } from "next/server"
+
+export async function GET() {
+  const session = await auth()
+  if (!session?.user?.id) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
+  }
+
+  const userId = session.user.id
+
+  try {
+    const [drinks, ratings, wishlistItems, preferences, sharedLists] =
+      await Promise.all([
+        prisma.drink.findMany({
+          where: { userId },
+          orderBy: { createdAt: "asc" },
+        }),
+        prisma.rating.findMany({
+          where: { userId },
+          include: { drink: { select: { name: true } } },
+          orderBy: { createdAt: "asc" },
+        }),
+        prisma.wishlistItem.findMany({
+          where: { userId },
+          orderBy: { createdAt: "asc" },
+        }),
+        prisma.userPreference.findUnique({ where: { userId } }),
+        prisma.sharedList.findMany({
+          where: { userId },
+          orderBy: { createdAt: "asc" },
+        }),
+      ])
+
+    const csv = generateBackupCsv(
+      drinks,
+      ratings,
+      wishlistItems,
+      preferences,
+      sharedLists
+    )
+
+    const date = new Date().toISOString().split("T")[0]
+
+    return new Response(csv, {
+      headers: {
+        "Content-Type": "text/csv; charset=utf-8",
+        "Content-Disposition": `attachment; filename="drinktracker-backup-${date}.csv"`,
+      },
+    })
+  } catch (error) {
+    console.error("Backup export error:", error)
+    return NextResponse.json(
+      { error: "Failed to generate backup" },
+      { status: 500 }
+    )
+  }
+}