feat: add readarr, whisparr, and bazarr stacks

- Add readarr_dev (eBook/audiobook collection manager, port 8787)
- Add whisparr_dev (adult content manager, port 6969)
- Add bazarr_dev (subtitle management companion, port 6767)
- Bazarr uses a shared /media volume for writing subtitles
- All stacks follow template conventions (defaults, proxy network,
  VOL_PATH=/data, README section order)

readarr_dev/compose.yaml

@@ -0,0 +1,20 @@
+services:
+  readarr:
+    image: ${READARR_IMAGE:-ghcr.io/hotio/readarr:release}
+    restart: ${READARR_RESTART:-unless-stopped}
+    volumes:
+      - ${VOL_PATH:-/data}/readarr/config:/config
+      - ${VOL_PATH:-/data}/readarr/data:/data
+    environment:
+      - PUID=1000
+      - PGID=1000
+      - UMASK=002
+      - TZ=${TZ:-America/Vancouver}
+    ports:
+      - "${READARR_PORT:-8787}:8787"
+    networks:
+      - proxy
+
+networks:
+  proxy:
+    external: true