feat: add lidarr_dev stack, rewrite prowlarr_dev, align template conventions

- Add lidarr_dev stack with compose.yaml, sample.env, and README
- Rewrite prowlarr_dev to match template conventions (compose.yaml,
  defaults on all vars, proxy network, README sections)
- Set default VOL_PATH to /data (absolute, never ./data)
- Reorder README sections: Overview → Project Details → Getting
  Started → Env Vars → Volume Notes → Network Notes → Docker Run
- Update template-readme.md and AGENTS.md with new conventions

prowlarr_dev/compose.yaml

@@ -0,0 +1,18 @@
+services:
+  prowlarr:
+    image: ${PROWLARR_IMAGE:-ghcr.io/hotio/prowlarr:release}
+    restart: ${PROWLARR_RESTART:-unless-stopped}
+    volumes:
+      - ${VOL_PATH:-/data}/prowlarr/config:/config
+    environment:
+      - PUID=1000
+      - PGID=1000
+      - UMASK=002
+    ports:
+      - "${PROWLARR_PORT:-9696}:9696"
+    networks:
+      - proxy
+
+networks:
+  proxy:
+    external: true