Add Calibre-Web infrastructure

Brain.md

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+# Calibre-Web Brain
+
+Service: Calibre-Web / Books
+
+Domain:
+
+```text
+https://books.mischlabs.de
+```
+
+Gitea target:
+
+```text
+https://git.mischlabs.de/MrDiderot/CalibreWeb.git
+```
+
+Current NAS state captured on 2026-05-21:
+
+```text
+Container: calibre-web
+Image:     lscr.io/linuxserver/calibre-web:latest
+Ports:     0.0.0.0:8083->8083/tcp, :::8083->8083/tcp
+Status:    Up 4 days
+```
+
+Mounts:
+
+```text
+/volume1/calibreweb/data/books  -> /books
+/volume1/calibreweb/data/config -> /config
+```
+
+Environment:
+
+```text
+TZ=Europe/Berlin
+PUID=1000
+PGID=1000
+```
+
+Note: The live Compose file uses `PGID=${PGID:-10}`, but the inspected running container reported `PGID=1000`. This likely comes from the NAS `.env`. Preserve the NAS `.env` value when redeploying.
+
+Compose path on NAS:
+
+```text
+/volume2/docker/calibreweb/docker-compose.yml
+```
+
+Decision:
+
+- This is currently an infrastructure repository, not a custom app image repository.
+- Use the upstream image `lscr.io/linuxserver/calibre-web:latest`.
+- The universal Watchtower instance on the NAS can update this service directly.
+- Only add a Dockerfile and Gitea Actions workflow if custom image changes become necessary later.
+- The initial `docker-compose.yml` in this repo was copied from the live NAS compose file at `/volume2/docker/calibreweb/docker-compose.yml`.
+
+Important:
+
+- Do not move or delete `/volume1/calibreweb/data/books`.
+- Do not move or delete `/volume1/calibreweb/data/config`.
+- If Calibre-Web appears empty after deployment, check bind mounts before assuming data loss.