Go: use NATS as the message queue (#15327)

### What problem does this PR solve?

```
RAGFlow(admin)> mq publish 'msg2';
SUCCESS
RAGFlow(admin)> mq publish 'msg3';
SUCCESS
RAGFlow(admin)> mq list;
+---------+---------------+
| message | subject       |
+---------+---------------+
| msg1    | tasks.RAGFLOW |
| msg2    | tasks.RAGFLOW |
| msg3    | tasks.RAGFLOW |
+---------+---------------+
RAGFlow(admin)> mq pull 2;
+---------+---------------+
| message | subject       |
+---------+---------------+
| msg1    | tasks.RAGFLOW |
| msg2    | tasks.RAGFLOW |
+---------+---------------+
RAGFlow(admin)> mq pull noack;
+---------+---------------+
| message | subject       |
+---------+---------------+
| abc     | tasks.RAGFLOW |
+---------+---------------+
RAGFlow(admin)> mq show
+-------------------+----------------+--------+---------------+---------------+-------------------+---------------+
| ack_pending_count | consumer_count | memory | message_count | pending_count | redelivered_count | waiting_count |
+-------------------+----------------+--------+---------------+---------------+-------------------+---------------+
| 2                 | 1              | 0      | 2             | 0             | 1                 | 0             |
+-------------------+----------------+--------+---------------+---------------+-------------------+---------------+

RAGFlow(admin)> list ingestors;
+--------------+-------------------------------------------+--------+
| host         | name                                      | status |
+--------------+-------------------------------------------+--------+
| 192.168.1.38 | ingestor-8f0e4bd5650a4ac58b0151969fbf6935 | alive  |
+--------------+-------------------------------------------+--------+

RAGFlow(admin)> list ingestion tasks;
+----------------------------------+----------------------------------+-----------+------+-------------+----------------------------------+
| document_id                      | id                               | status    | step | user        | user_id                          |
+----------------------------------+----------------------------------+-----------+------+-------------+----------------------------------+
| ffe64fae423411f1a2d938a74640adcc | 90d3d0f6528941c1ac8eb0360effccc4 | COMPLETED | 5    | aaa@aaa.com | 2ba4881420fa11f19e9c38a74640adcc |
+----------------------------------+----------------------------------+-----------+------+-------------+----------------------------------+

RAGFlow(admin)> remove ingestion tasks '90d3d0f6528941c1ac8eb0360effccc4';
+---------+----------------------------------+
| delete  | task_id                          |
+---------+----------------------------------+
| success | 90d3d0f6528941c1ac8eb0360effccc4 |
+---------+----------------------------------+

RAGFlow(admin)> stop ingestion tasks 'e89e20d9a25848a1b79bd9345ddbfe1d';
+----------+----------------------------------+
| status   | task_id                          |
+----------+----------------------------------+
| STOPPING | e89e20d9a25848a1b79bd9345ddbfe1d |
+----------+----------------------------------+

# Publish a message
RAGFlow(admin)> mq publish 'cdd';
SUCCESS

# List current tasks in the message queue
RAGFlow(admin)> mq list
+----------------------------------+---------------+
| message                          | subject       |
+----------------------------------+---------------+
| 7ce392a3c1624cd2be4b5276e8825059 | tasks.RAGFLOW |
+----------------------------------+---------------+

# Consume a task from the message queue
RAGFlow(admin)> mq pull
+------+-----+----------------+
| ack  | id  | type           |
+------+-----+----------------+
| true | cdd | ingestion_test |
+------+-----+----------------+

# User mode
# List ingestion tasks, followed by dataset id
RAGFlow(user)> list ingestion tasks from '0abe79f9423311f1ad8d38a74640adcc';
+---------------------------+---------------+----------------------------------+----------------------------------+----------------------------------+--------+-----------+---------------------------+---------------+----------------------------------+
| create_date               | create_time   | dataset_id                       | document_id                      | id                               | schema | status    | update_date               | update_time   | user_id                          |
+---------------------------+---------------+----------------------------------+----------------------------------+----------------------------------+--------+-----------+---------------------------+---------------+----------------------------------+
| 2026-05-30T20:21:06+08:00 | 1780143666289 | 0abe79f9423311f1ad8d38a74640adcc | ffe64fae423411f1a2d938a74640adcc | 8d758cd14a8b4ba8ab505003fb52017d |        | COMPLETED | 2026-05-30T20:21:26+08:00 | 1780143686431 | 2ba4881420fa11f19e9c38a74640adcc |
+---------------------------+---------------+----------------------------------+----------------------------------+----------------------------------+--------+-----------+---------------------------+---------------+----------------------------------+

RAGFlow(user)> list ingestion tasks;
+---------------------------+---------------+----------------------------------+----------------------------------+----------------------------------+--------+-----------+---------------------------+---------------+----------------------------------+
| create_date               | create_time   | dataset_id                       | document_id                      | id                               | schema | status    | update_date               | update_time   | user_id                          |
+---------------------------+---------------+----------------------------------+----------------------------------+----------------------------------+--------+-----------+---------------------------+---------------+----------------------------------+
| 2026-06-02T19:02:31+08:00 | 1780398151417 | 0abe79f9423311f1ad8d38a74640adcc | ffe64fae423411f1a2d938a74640adcc | e89e20d9a25848a1b79bd9345ddbfe1d |        | COMPLETED | 2026-06-02T19:02:52+08:00 | 1780398172208 | 2ba4881420fa11f19e9c38a74640adcc |
+---------------------------+---------------+----------------------------------+----------------------------------+----------------------------------+--------+-----------+---------------------------+---------------+----------------------------------+

# Create an ingestion task
# First argument is document id, second argument is dataset id
RAGFlow(user)> start ingestion 'ffe64fae423411f1a2d938a74640adcc' from '0abe79f9423311f1ad8d38a74640adcc';
+----------------------------------+-------------------------------------------+
| document_id                      | result                                    |
+----------------------------------+-------------------------------------------+
| ffe64fae423411f1a2d938a74640adcc | task_id: 8d758cd14a8b4ba8ab505003fb52017d |
+----------------------------------+-------------------------------------------+

# Pause an ingestion task, first argument is ingestion id
RAGFlow(user)> stop ingestion '8d758cd14a8b4ba8ab505003fb52017d';
+---------------------------+---------------+----------------------------------+----------------------------------+----------------------------------+--------+-----------+---------------------------+---------------+----------------------------------+
| create_date               | create_time   | dataset_id                       | document_id                      | id                               | schema | status    | update_date               | update_time   | user_id                          |
+---------------------------+---------------+----------------------------------+----------------------------------+----------------------------------+--------+-----------+---------------------------+---------------+----------------------------------+
| 2026-05-30T20:21:06+08:00 | 1780143666289 | 0abe79f9423311f1ad8d38a74640adcc | ffe64fae423411f1a2d938a74640adcc | 8d758cd14a8b4ba8ab505003fb52017d |        | COMPLETED | 2026-05-30T20:21:26+08:00 | 1780143686431 | 2ba4881420fa11f19e9c38a74640adcc |
+---------------------------+---------------+----------------------------------+----------------------------------+----------------------------------+--------+-----------+---------------------------+---------------+----------------------------------+

# Delete an ingestion task
RAGFlow(api/default)> remove ingestion tasks 'f366450a27d54677aec1c7090add30f0';
+---------+----------------------------------+
| remove  | task_id                          |
+---------+----------------------------------+
| success | f366450a27d54677aec1c7090add30f0 |
+---------+----------------------------------+

```

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

docker/.env

@@ -145,6 +145,9 @@ REDIS_PORT=6379
 # The password for Redis.
 REDIS_PASSWORD=infini_rag_flow
 
+NATS_HOST=nats
+NATS_PORT=4222
+
 # The port used to expose RAGFlow's HTTP API service to the host machine,
 # allowing EXTERNAL access to the service running inside the Docker container.
 SVR_WEB_HTTP_PORT=80

docker/docker-compose-base.yml

@@ -250,6 +250,25 @@ services:
       timeout: 10s
       retries: 120
 
+  nats:
+    profiles:
+      - ragflow-go
+    image: nats:2.14.1
+    ports:
+      - ${NATS_PORT}:4222
+      - "8222:8222"
+    volumes:
+      - nats_data:/data
+    command: -js -sd /data
+    env_file: .env
+    networks:
+      - ragflow
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "nc", "-z", "localhost", "${NATS_PORT}"]
+      interval: 10s
+      timeout: 10s
+      retries: 120
 
   tei-cpu:
     profiles:
@@ -329,6 +348,8 @@ volumes:
     driver: local
   kibana_data:
     driver: local
+  nats_data:
+    driver: local
 
 networks:
   ragflow:

docker/service_conf.yaml.template

@@ -60,6 +60,9 @@ redis:
   username: '${REDIS_USERNAME:-}'
   password: '${REDIS_PASSWORD:-infini_rag_flow}'
   host: '${REDIS_HOST:-redis}:6379'
+nats:
+  host: ${NATS_HOST:-0.0.0.0}
+  port: ${NATS_PORT:-4222}
 user_default_llm:
   default_models:
     embedding_model: