Add ntfy push and Listmonk newsletter with lightweight Docker deploy tooling.

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

docker/integrations/docker-compose.yml

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+# 轻量集成：仅 Listmonk（Go）+ PostgreSQL
+# 视频/预约沿用既有 MiroTalk + The Lounge，不自托管 Cal/Owncast/PeerTube
+services:
+  postgres-int:
+    image: postgres:16-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER:-nomadro}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?set POSTGRES_PASSWORD}
+    ports:
+      - "127.0.0.1:5433:5432"
+    volumes:
+      - pg-int:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-nomadro}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    mem_limit: 128m
+
+  listmonk:
+    image: listmonk/listmonk:v5.0.0
+    restart: unless-stopped
+    depends_on:
+      postgres-int:
+        condition: service_healthy
+    ports:
+      - "127.0.0.1:9030:9000"
+    environment:
+      LISTMONK_app__address: 0.0.0.0:9000
+      LISTMONK_app__admin_username: ${LISTMONK_ADMIN_USER:-admin}
+      LISTMONK_app__admin_password: ${LISTMONK_ADMIN_PASSWORD:?set LISTMONK_ADMIN_PASSWORD}
+      LISTMONK_db__host: postgres-int
+      LISTMONK_db__port: 5432
+      LISTMONK_db__user: ${POSTGRES_USER:-nomadro}
+      LISTMONK_db__password: ${POSTGRES_PASSWORD:?set POSTGRES_PASSWORD}
+      LISTMONK_db__database: listmonk
+      LISTMONK_db__ssl_mode: disable
+    command: [sh, -c, "./listmonk --install --idempotent --yes && ./listmonk"]
+    mem_limit: 128m
+
+volumes:
+  pg-int: