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/Infrastructure/authentik-server.md

@@ -15,7 +15,7 @@ This is the service the Caddy `forward_auth` vhosts proxy to
 `https://auth.franksdank.cloud`.
 
 - **Unit:** `dankclaw/authentik/quadlet/authentik-server.container` (`authentik-server.service`)
-- **Image:** `ghcr.io/goauthentik/server:2026.8.0` (command: `server`)
+- **Image:** `ghcr.io/goauthentik/server:2026.8.3` (command: `server`)
 - **Port:** `9000` (published; the outpost + admin + login all live here)
 - **Data:** `/home/dank/authentik/data` (bind mount, shared with the worker)
 - **Health:** `http://localhost:9000/-/health/`