Add full homelab inventory and remaining home services.

UniFi, Joplin, Glance, Uptime Kuma, Whoogle, Synology packages docs,
Proxmox LXC inventory, Portainer stacks, and INVENTORY.md master list.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/joplin/README.md

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+# Joplin Server
+
+Notes server. Bestaande data: `/volume1/docker/joplin` (beperkte toegang uid 999).
+
+Poort: **22300**. Gebruikt PostgreSQL — kan `postgres-homelab` hergebruiken i.p.v. aparte `joplin-db`.

apps/joplin/docker-compose.yml

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+# Joplin Server — data op NAS (map /volume1/docker/joplin, uid 999)
+services:
+  joplin:
+    image: joplin/server:latest
+    container_name: joplin
+    restart: unless-stopped
+    ports:
+      - "${JOPLIN_PORT:-22300}:22300"
+    environment:
+      APP_PORT: 22300
+      APP_BASE_URL: ${JOPLIN_BASE_URL:-http://192.168.1.211:22300}
+      DB_CLIENT: pg
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-WaQTUw2t}
+      POSTGRES_DATABASE: ${JOPLIN_DB:-joplin}
+      POSTGRES_USER: ${POSTGRES_USER:-mo}
+      POSTGRES_PORT: 5432
+      POSTGRES_HOST: postgres-homelab
+    depends_on:
+      - joplin-db
+
+  joplin-db:
+    image: postgres:16-alpine
+    container_name: joplin-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-WaQTUw2t}
+      POSTGRES_USER: ${POSTGRES_USER:-mo}
+      POSTGRES_DB: ${JOPLIN_DB:-joplin}
+    volumes:
+      - joplin-db-data:/var/lib/postgresql/data
+
+volumes:
+  joplin-db-data: