Initial commit: PFI fleet inventory, stacks, tooling, and backup pipeline

Captures the full workspace state built up to this point:

  - CLAUDE.md + README.md describing conventions and the four-host fleet
    (ana-ml2, ana-docker, nh3-docker, esh-docker-vm).
  - Per-host notes under servers/<host>/ with ssh-target fallback files
    and latest system-details snapshots (two in-compose credential leaks
    scrubbed; the upstream compose files still need to move those to .env).
  - scripts/: server_inspect.sh (read-only remote diagnostic),
    refresh-server-info.sh (dir-driven discovery + snapshot capture with
    validation warnings), add-host.sh, sync-stacks.sh (pull
    compose/conf trees), deploy-stack.sh (push with per-file diff + prompt).
  - stacks/: canonical compose for backrest, beszel, dozzle, llama-swap,
    rest-server-ana, rest-server-nh3, vllm-qwen3, plus the retired
    infinity reference. All use the .env-driven + traefik-net + homepage
    label pattern.
  - configs/restic/ana-docker/: first resticprofile config + pre-backup
    hook (Synapse pg_dump, Seafile mysqldump, Vaultwarden SQLite); templates
    for the other three hosts to come.
  - docs/pfi/: general infrastructure reference carried over.
  - .gitignore excludes .env, stacks-mirror/, and assorted secret/state
    filenames to prevent re-leaks on later commits.

stacks/rest-server-nh3/compose.yaml

@@ -0,0 +1,40 @@
+# rest-server (NH3 Synology) — restic backup target for the fleet.
+#
+# Deploys into Synology Container Manager on 10.100.50.50. Data lives on
+# a Btrfs shared folder so it gets Synology snapshots + optional
+# replication to a sibling share if you configure one later.
+#
+# Auth model:
+#   --private-repos : every URL path must start with /<username>/ and the
+#                     HTTP basic-auth user must match. One user per host.
+#                     Per-host repos are strictly isolated.
+#   --append-only   : on-disk data can be ADDED but not REMOVED or REWRITTEN.
+#                     A compromised host can't delete its own history.
+#                     Prune requires disabling this (see README).
+#
+# Credentials come from /data/.htpasswd — see README for how to populate
+# it. That file is mounted read-only into the container.
+#
+# All tunables live in .env — edit that, not this file.
+
+services:
+  rest-server:
+    image: restic/rest-server:${REST_SERVER_VERSION}
+    container_name: rest-server
+    restart: unless-stopped
+    ports:
+      - "${REST_PORT}:8000"
+    volumes:
+      - ${DATA_DIR}:/data
+    environment:
+      - OPTIONS=--private-repos --append-only --prometheus ${EXTRA_OPTIONS:-}
+      - TZ=${TZ:-America/Los_Angeles}
+    # rest-server stores repos under /data and looks for /data/.htpasswd
+    # automatically — no extra bind mount needed as long as the htpasswd
+    # file is created inside DATA_DIR before startup.
+    healthcheck:
+      test: ["CMD-SHELL", "wget -qO- http://localhost:8000/metrics >/dev/null || exit 1"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 15s