v0.6.0 — Backup & Restore page; install netcat for Postgres-wait

Version the backup/restore feature that merged in unversioned, and add
netcat-openbsd to the bookworm-slim runtime so the new entrypoint Postgres
readiness check (nc -z postgres 5432) works instead of looping forever.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/lib/changelog.ts

@@ -8,6 +8,14 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.6.0",
+    date: "2026-06-15",
+    changes: [
+      "New Backup & Restore page under Settings — download a full copy of your garden data as a zip, or restore from one by dragging the file in.",
+      "The app now waits for the database to be ready before starting, so it comes back up cleanly after a server reboot.",
+    ],
+  },
   {
     version: "0.5.2",
     date: "2026-06-15",

src/lib/version.ts

@@ -1,2 +1,2 @@
 // Bump on every user-visible release. Changelog entries live in `src/lib/changelog.ts`.
-export const APP_VERSION = "0.5.2";
+export const APP_VERSION = "0.6.0";