Bump pinned images to latest: authentik 2026.8.3, tautulli ls245, calibre-web ls402, plex 1.43.4

- authentik 2026.8.0 -> 2026.8.3 (server, worker, outpost quadlets)
- tautulli v2.18.1-ls242 -> v2.18.1-ls245
- calibre-web 0.6.27-ls397 -> 0.6.27-ls402
- plex 1.43.3.10896-ls322 -> 1.43.4.10903-ls325
- seerr already at v3.4.1 (latest, no bump)
- sync docs + the dead compose.yaml plex entry

anubis is already at the latest stable (v1.27.0); only pre-releases exist
beyond it, so no stable bump. Local-build images (caddy, alloy, loki,
comfyui, hermes) are refreshed by forced --no-cache rebuilds, not pins.

serverAppConfigs-docs/Dankserver/Plex.md

@@ -24,7 +24,7 @@ public traffic can be fronted by Caddy like every other vhost.
 | Item | Value |
 |------|-------|
 | Runtime | podman quadlet, `plex.service` (user manager) — migrated from the native `plexmediaserver.service` OS-package unit (2026-09) |
-| Image | `lscr.io/linuxserver/plex:1.43.3.10896-cb3ebc72d-ls322` (pinned; verified == the ghcr `latest` manifest digest at pin time) |
+| Image | `lscr.io/linuxserver/plex:1.43.4.10903-e5521bd8c-ls325` (pinned; verified == the ghcr `latest` manifest digest at pin time) |
 | Data root | `/var/lib/plexmediaserver` bind-mounted **in place** as `/config` (RW) — the migration moved zero bytes |
 | Media | `/mnt/entropy` mounted at the same absolute path **read-only** — every library path in the PMS database stayed valid, zero re-scan |
 | Identity | fleet rootless model — container root maps to the `dank` user (1000:1000); the deployer chowns the data root on first cutover |