dev/e2e: disposable server for app e2e / agent UI testing

`dev/e2e/e2e.sh up` runs an isolated ImageApi (port 8090, own build dir,
db, thumbnails, HLS) next to a real local server, serving a copy of a
synthetic fixture library. Every fixture image has its path, date and
scenario burned into the pixels; manifest.json records expected dates,
GPS, cameras, tags and counts. `reset` restores the baseline.

- LOCAL_BIND_URL makes the hardcoded localhost:8088 listener
  configurable (default unchanged; empty disables it) so a second
  instance can start.
- create_user bin: the server has no registration route; idempotent.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dev/e2e/.gitignore

@@ -0,0 +1,2 @@
+.work/
+env.local