feat: add OpenViking DeerFlow Mattermost OpenFang and Paperclip services

apps/mattermost/.env.example

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+# Image versions
+MATTERMOST_VERSION=11.3
+POSTGRES_VERSION=17-alpine
+
+# Network configuration
+MATTERMOST_PORT_OVERRIDE=8065
+MATTERMOST_SITE_URL=http://localhost:8065
+
+# PostgreSQL configuration
+POSTGRES_DB=mattermost
+POSTGRES_USER=mmuser
+POSTGRES_PASSWORD=mmchangeit
+
+# Mattermost runtime configuration
+MATTERMOST_ENABLE_LOCAL_MODE=false
+
+# Resources - Mattermost
+MATTERMOST_CPU_LIMIT=2.00
+MATTERMOST_MEMORY_LIMIT=2G
+MATTERMOST_CPU_RESERVATION=0.50
+MATTERMOST_MEMORY_RESERVATION=512M
+
+# Resources - PostgreSQL
+MATTERMOST_DB_CPU_LIMIT=1.00
+MATTERMOST_DB_MEMORY_LIMIT=1G
+MATTERMOST_DB_CPU_RESERVATION=0.25
+MATTERMOST_DB_MEMORY_RESERVATION=256M
+
+# Logging
+MATTERMOST_LOG_MAX_SIZE=100m
+MATTERMOST_LOG_MAX_FILE=3
+
+# Timezone
+TZ=UTC

apps/mattermost/README.md

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+# Mattermost
+
+[中文文档](README.zh.md)
+
+Mattermost is an open-source team collaboration platform that provides chat, file sharing, channels, and integrations. This Compose stack includes Mattermost plus PostgreSQL and is designed to start with a single `docker compose up -d`.
+
+## Quick Start
+
+1. Copy the example environment file:
+
+   ```bash
+   cp .env.example .env
+   ```
+
+2. Edit `.env` if you want to change the port, site URL, or database password.
+
+3. Start the stack:
+
+   ```bash
+   docker compose up -d
+   ```
+
+4. Open Mattermost:
+
+   - <http://localhost:8065>
+
+5. Complete the first-run wizard to create the initial system admin account.
+
+## Default Ports
+
+| Service    | Port | Description            |
+| ---------- | ---- | ---------------------- |
+| Mattermost | 8065 | Web UI and API         |
+| PostgreSQL | 5432 | Internal database only |
+
+## Important Environment Variables
+
+| Variable                       | Description                                    | Default                 |
+| ------------------------------ | ---------------------------------------------- | ----------------------- |
+| `MATTERMOST_VERSION`           | Mattermost Team Edition image tag              | `11.3`                  |
+| `MATTERMOST_PORT_OVERRIDE`     | Host port for Mattermost                       | `8065`                  |
+| `MATTERMOST_SITE_URL`          | Public URL used by Mattermost                  | `http://localhost:8065` |
+| `POSTGRES_DB`                  | PostgreSQL database name                       | `mattermost`            |
+| `POSTGRES_USER`                | PostgreSQL user                                | `mmuser`                |
+| `POSTGRES_PASSWORD`            | PostgreSQL password                            | `mmchangeit`            |
+| `MATTERMOST_ENABLE_LOCAL_MODE` | Enables local mode for administrative commands | `false`                 |
+| `TZ`                           | Container timezone                             | `UTC`                   |
+
+## Volumes
+
+- `mattermost_postgres_data`: PostgreSQL data.
+- `mattermost_config`: Mattermost config directory.
+- `mattermost_data`: Uploaded files and application data.
+- `mattermost_logs`: Application logs.
+- `mattermost_plugins`: Server-side plugins.
+- `mattermost_client_plugins`: Webapp plugins.
+- `mattermost_bleve_indexes`: Search indexes.
+
+## Notes
+
+- The application depends on PostgreSQL and waits until the database is healthy before booting.
+- The default setup uses Team Edition.
+- If you expose Mattermost behind a reverse proxy or different hostname, update `MATTERMOST_SITE_URL`.
+
+## References
+
+- [Mattermost Repository](https://github.com/mattermost/mattermost)
+- [Mattermost Team Edition Image](https://hub.docker.com/r/mattermost/mattermost-team-edition)

apps/mattermost/README.zh.md

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+# Mattermost
+
+[English](README.md)
+
+Mattermost 是一个开源团队协作平台，提供聊天、频道、文件共享和集成能力。这个 Compose 配置包含 Mattermost 和 PostgreSQL，目标是用一条 `docker compose up -d` 完成启动。
+
+## 快速开始
+
+1. 复制环境变量示例文件：
+
+   ```bash
+   cp .env.example .env
+   ```
+
+2. 按需修改 `.env`，例如端口、站点 URL 或数据库密码。
+
+3. 启动整个栈：
+
+   ```bash
+   docker compose up -d
+   ```
+
+4. 打开 Mattermost：
+
+   - <http://localhost:8065>
+
+5. 按照首次启动向导创建初始系统管理员账号。
+
+## 默认端口
+
+| 服务       | 端口 | 说明                 |
+| ---------- | ---- | -------------------- |
+| Mattermost | 8065 | Web 界面与 API       |
+| PostgreSQL | 5432 | 仅供内部使用的数据库 |
+
+## 关键环境变量
+
+| 变量                           | 说明                             | 默认值                  |
+| ------------------------------ | -------------------------------- | ----------------------- |
+| `MATTERMOST_VERSION`           | Mattermost Team Edition 镜像标签 | `11.3`                  |
+| `MATTERMOST_PORT_OVERRIDE`     | Mattermost 对外端口              | `8065`                  |
+| `MATTERMOST_SITE_URL`          | Mattermost 对外访问 URL          | `http://localhost:8065` |
+| `POSTGRES_DB`                  | PostgreSQL 数据库名              | `mattermost`            |
+| `POSTGRES_USER`                | PostgreSQL 用户名                | `mmuser`                |
+| `POSTGRES_PASSWORD`            | PostgreSQL 密码                  | `mmchangeit`            |
+| `MATTERMOST_ENABLE_LOCAL_MODE` | 是否启用本地管理模式             | `false`                 |
+| `TZ`                           | 容器时区                         | `UTC`                   |
+
+## 数据卷
+
+- `mattermost_postgres_data`：PostgreSQL 数据。
+- `mattermost_config`：Mattermost 配置目录。
+- `mattermost_data`：上传文件和业务数据。
+- `mattermost_logs`：应用日志。
+- `mattermost_plugins`：服务端插件。
+- `mattermost_client_plugins`：前端插件。
+- `mattermost_bleve_indexes`：搜索索引。
+
+## 说明
+
+- Mattermost 依赖 PostgreSQL，只有数据库健康后才会继续启动。
+- 这里默认使用 Team Edition。
+- 如果你通过反向代理或自定义域名访问 Mattermost，请同步修改 `MATTERMOST_SITE_URL`。
+
+## 参考资料
+
+- [Mattermost 仓库](https://github.com/mattermost/mattermost)
+- [Mattermost Team Edition 镜像](https://hub.docker.com/r/mattermost/mattermost-team-edition)

apps/mattermost/docker-compose.yaml

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+x-defaults: &defaults
+  restart: unless-stopped
+  logging:
+    driver: json-file
+    options:
+      max-size: ${MATTERMOST_LOG_MAX_SIZE:-100m}
+      max-file: '${MATTERMOST_LOG_MAX_FILE:-3}'
+
+services:
+  mattermost-postgres:
+    <<: *defaults
+    image: ${GLOBAL_REGISTRY:-}postgres:${POSTGRES_VERSION:-17-alpine}
+    environment:
+      - TZ=${TZ:-UTC}
+      - POSTGRES_DB=${POSTGRES_DB:-mattermost}
+      - POSTGRES_USER=${POSTGRES_USER:-mmuser}
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD:-mmchangeit}
+      - PGDATA=/var/lib/postgresql/data/pgdata
+    volumes:
+      - mattermost_postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: [CMD-SHELL, pg_isready -U $$POSTGRES_USER -d $$POSTGRES_DB]
+      interval: 15s
+      timeout: 5s
+      retries: 10
+      start_period: 20s
+    deploy:
+      resources:
+        limits:
+          cpus: ${MATTERMOST_DB_CPU_LIMIT:-1.00}
+          memory: ${MATTERMOST_DB_MEMORY_LIMIT:-1G}
+        reservations:
+          cpus: ${MATTERMOST_DB_CPU_RESERVATION:-0.25}
+          memory: ${MATTERMOST_DB_MEMORY_RESERVATION:-256M}
+
+  mattermost:
+    <<: *defaults
+    image: ${GLOBAL_REGISTRY:-}mattermost/mattermost-team-edition:${MATTERMOST_VERSION:-11.3}
+    depends_on:
+      mattermost-postgres:
+        condition: service_healthy
+    ports:
+      - '${MATTERMOST_PORT_OVERRIDE:-8065}:8065'
+    environment:
+      - TZ=${TZ:-UTC}
+      - MM_SQLSETTINGS_DRIVERNAME=postgres
+      - MM_SQLSETTINGS_DATASOURCE=postgres://${POSTGRES_USER:-mmuser}:${POSTGRES_PASSWORD:-mmchangeit}@mattermost-postgres:5432/${POSTGRES_DB:-mattermost}?sslmode=disable&connect_timeout=10
+      - MM_SERVICESETTINGS_SITEURL=${MATTERMOST_SITE_URL:-http://localhost:8065}
+      - MM_SERVICESETTINGS_ENABLELOCALMODE=${MATTERMOST_ENABLE_LOCAL_MODE:-false}
+      - MM_PLUGINSETTINGS_ENABLEUPLOADS=true
+      - MM_BLEVESETTINGS_INDEXDIR=/mattermost/bleve-indexes
+      - MM_FILESETTINGS_DIRECTORY=/mattermost/data
+    env_file:
+      - .env
+    volumes:
+      - mattermost_config:/mattermost/config
+      - mattermost_data:/mattermost/data
+      - mattermost_logs:/mattermost/logs
+      - mattermost_plugins:/mattermost/plugins
+      - mattermost_client_plugins:/mattermost/client/plugins
+      - mattermost_bleve_indexes:/mattermost/bleve-indexes
+    healthcheck:
+      test: [CMD, /mattermost/bin/mmctl, system, status, --local]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 60s
+    deploy:
+      resources:
+        limits:
+          cpus: ${MATTERMOST_CPU_LIMIT:-2.00}
+          memory: ${MATTERMOST_MEMORY_LIMIT:-2G}
+        reservations:
+          cpus: ${MATTERMOST_CPU_RESERVATION:-0.50}
+          memory: ${MATTERMOST_MEMORY_RESERVATION:-512M}
+
+volumes:
+  mattermost_postgres_data:
+  mattermost_config:
+  mattermost_data:
+  mattermost_logs:
+  mattermost_plugins:
+  mattermost_client_plugins:
+  mattermost_bleve_indexes: