refactor: split monolith into per-domain stacks (Phase A: build)

Add stacks/<domain>/ compose + env for the 11 target stacks (proxy, media,
foundry, owncloud, resume, famapp, authentik, notify, monitoring, remote, dev).
Each app stack joins a shared external `edge` network for Caddy and keeps its
DB/cache co-located (no shared backing services). All named volumes convert to
tiered bind mounts: DBs/configs -> /config (SSD), blobs/repos/registry ->
/storage1/labdata (ZFS). Gitea repos+LFS split to ZFS.

Move Vault into the management plane (portainer-compose.yml) and add the shared
`edge` network there. apply-compose.ps1 -Portainer now also pushes vault.hcl.

Additive only: root docker-compose.yml/.env/Caddyfile untouched, so the live
monolith is unchanged. Live cutover (Phase B) is next.

stacks/authentik/.env

@@ -0,0 +1,6 @@
+# authentik stack secrets
+AUTHENTIK_IMAGE_TAG=2024.12.3
+AUTHENTIK_DB_USER=authentik
+AUTHENTIK_DB_PASSWORD=ebb7d34ecbc4fc8f95cd16ef491d2162cdf8
+AUTHENTIK_DB_NAME=authentik
+AUTHENTIK_SECRET_KEY=C33S/oXOVOLrlLnWGMRYadgH9zfEC7Bm1vHtbczkFxHcTOj9j6io397c/OGb

stacks/authentik/docker-compose.yml

@@ -0,0 +1,92 @@
+# authentik stack — Authentik server + worker + dedicated Postgres and Redis.
+#
+# Volume -> bind-mount conversions (both low density -> SSD):
+#   db    data -> /config/authentik/postgres
+#   redis data -> /config/authentik/redis
+# Only the server joins edge (auth.ginnoir.com); worker/db/redis stay private.
+
+services:
+  authentik-server:
+    container_name: authentik_server
+    image: ghcr.io/goauthentik/server:${AUTHENTIK_IMAGE_TAG:-2024.12.3}
+    restart: unless-stopped
+    command: server
+    networks: [authentik, edge]
+    environment:
+      AUTHENTIK_REDIS__HOST: authentik-redis
+      AUTHENTIK_POSTGRESQL__HOST: authentik-db
+      AUTHENTIK_POSTGRESQL__USER: ${AUTHENTIK_DB_USER:-authentik}
+      AUTHENTIK_POSTGRESQL__PASSWORD: ${AUTHENTIK_DB_PASSWORD}
+      AUTHENTIK_POSTGRESQL__NAME: ${AUTHENTIK_DB_NAME:-authentik}
+      AUTHENTIK_SECRET_KEY: ${AUTHENTIK_SECRET_KEY}
+      AUTHENTIK_ERROR_REPORTING__ENABLED: "false"
+    ports:
+      - "9200:9000"
+    depends_on:
+      authentik-db:
+        condition: service_healthy
+      authentik-redis:
+        condition: service_healthy
+
+  authentik-worker:
+    container_name: authentik_worker
+    image: ghcr.io/goauthentik/server:${AUTHENTIK_IMAGE_TAG:-2024.12.3}
+    restart: unless-stopped
+    command: worker
+    networks: [authentik]
+    environment:
+      AUTHENTIK_REDIS__HOST: authentik-redis
+      AUTHENTIK_POSTGRESQL__HOST: authentik-db
+      AUTHENTIK_POSTGRESQL__USER: ${AUTHENTIK_DB_USER:-authentik}
+      AUTHENTIK_POSTGRESQL__PASSWORD: ${AUTHENTIK_DB_PASSWORD}
+      AUTHENTIK_POSTGRESQL__NAME: ${AUTHENTIK_DB_NAME:-authentik}
+      AUTHENTIK_SECRET_KEY: ${AUTHENTIK_SECRET_KEY}
+      AUTHENTIK_ERROR_REPORTING__ENABLED: "false"
+    depends_on:
+      authentik-db:
+        condition: service_healthy
+      authentik-redis:
+        condition: service_healthy
+
+  authentik-db:
+    container_name: postgres_authentik
+    image: postgres:16-alpine
+    restart: unless-stopped
+    networks: [authentik]
+    environment:
+      POSTGRES_USER: ${AUTHENTIK_DB_USER:-authentik}
+      POSTGRES_PASSWORD: ${AUTHENTIK_DB_PASSWORD}
+      POSTGRES_DB: ${AUTHENTIK_DB_NAME:-authentik}
+    volumes:
+      - /config/authentik/postgres:/var/lib/postgresql/data
+    healthcheck:
+      test:
+        [
+          "CMD-SHELL",
+          "pg_isready -U ${AUTHENTIK_DB_USER:-authentik} -d ${AUTHENTIK_DB_NAME:-authentik}",
+        ]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  authentik-redis:
+    container_name: redis_authentik
+    image: redis:7-alpine
+    restart: unless-stopped
+    networks: [authentik]
+    command: --save 60 1 --loglevel warning
+    volumes:
+      - /config/authentik/redis:/data
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+networks:
+  authentik:
+    name: authentik
+    driver: bridge
+  edge:
+    name: edge
+    external: true