Dev instance: gitignore .next-dev/.freezmo-dev, tsconfig types for .next-dev

The dev service's build folder and data folder are runtime artifacts; the
dev server also adds .next-dev/types to the tsconfig includes, which is
what typed routes need there.

.gitignore

@@ -15,6 +15,8 @@
 
 # next.js
 /.next/
+# dev instance build folder (NEXT_DIST_DIR)
+/.next-dev/
 /out/
 
 # production
@@ -51,6 +53,8 @@ copy.txt
 
 # server-side encrypted sync blobs (runtime data, not source)
 /.freezmo/
+# dev instance runtime data
+/.freezmo-dev/
 
 # e2e suite scratch (push subscriptions for the VAPID test instance)
 /tests/.tmp/