feat: Add Step 13 - Search System with Apache Solr and Data Persistence

- Implemented search service with Apache Solr instead of Elasticsearch
- Added full-text search, faceted search, and autocomplete capabilities
- Created data indexer for synchronizing data from MongoDB/Kafka to Solr
- Configured external volume mounts for all data services:
  - MongoDB, Redis, Kafka, Zookeeper, MinIO, Solr
  - All data now persists in ./data/ directory
- Added comprehensive search API endpoints
- Created documentation for data persistence and backup strategies

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

docker-compose.yml

@@ -76,7 +76,7 @@ services:
       - CONVERT_TO_WEBP=true
     volumes:
       - ./services/images/backend:/app
-      - images_cache:/app/cache
+      - ./data/images-cache:/app/cache
     networks:
       - site11_network
     restart: unless-stopped
@@ -118,8 +118,8 @@ services:
     ports:
       - "${MONGODB_PORT}:27017"
     volumes:
-      - mongodb_data:/data/db
-      - mongodb_config:/data/configdb
+      - ./data/mongodb:/data/db
+      - ./data/mongodb/configdb:/data/configdb
     networks:
       - site11_network
     restart: unless-stopped
@@ -135,7 +135,7 @@ services:
     ports:
       - "${REDIS_PORT}:6379"
     volumes:
-      - redis_data:/data
+      - ./data/redis:/data
     networks:
       - site11_network
     restart: unless-stopped
@@ -154,8 +154,8 @@ services:
     ports:
       - "${KAFKA_ZOOKEEPER_PORT}:2181"
     volumes:
-      - zookeeper_data:/var/lib/zookeeper/data
-      - zookeeper_logs:/var/lib/zookeeper/log
+      - ./data/zookeeper/data:/var/lib/zookeeper/data
+      - ./data/zookeeper/logs:/var/lib/zookeeper/log
     networks:
       - site11_network
     restart: unless-stopped
@@ -181,7 +181,7 @@ services:
       KAFKA_JMX_HOSTNAME: localhost
       KAFKA_AUTO_CREATE_TOPICS_ENABLE: 'true'
     volumes:
-      - kafka_data:/var/lib/kafka/data
+      - ./data/kafka:/var/lib/kafka/data
     networks:
       - site11_network
     restart: unless-stopped
@@ -234,7 +234,7 @@ services:
       - MINIO_ROOT_USER=${MINIO_ROOT_USER:-minioadmin}
       - MINIO_ROOT_PASSWORD=${MINIO_ROOT_PASSWORD:-minioadmin}
     volumes:
-      - minio_data:/data
+      - ./data/minio:/data
     command: server /data --console-address ":9001"
     networks:
       - site11_network
@@ -264,7 +264,7 @@ services:
       - MINIO_SECURE=false
     volumes:
       - ./services/files/backend:/app
-      - files_temp:/tmp
+      - ./data/files-temp:/tmp
     networks:
       - site11_network
     restart: unless-stopped
@@ -277,6 +277,57 @@ services:
       timeout: 10s
       retries: 3
 
+  # Apache Solr Search Engine
+  solr:
+    image: solr:9.4
+    container_name: ${COMPOSE_PROJECT_NAME}_solr
+    ports:
+      - "8983:8983"
+    volumes:
+      - ./data/solr:/var/solr
+      - ./services/search/solr-config:/opt/solr/server/solr/configsets/site11_config
+    command:
+      - solr-precreate
+      - site11
+      - /opt/solr/server/solr/configsets/site11_config
+    networks:
+      - site11_network
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8983/solr/site11/admin/ping"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  # Search Service
+  search-backend:
+    build:
+      context: ./services/search/backend
+      dockerfile: Dockerfile
+    container_name: ${COMPOSE_PROJECT_NAME}_search_backend
+    ports:
+      - "8015:8000"
+    environment:
+      - ENV=${ENV}
+      - PORT=8000
+      - SOLR_URL=http://solr:8983/solr
+      - MONGODB_URL=${MONGODB_URL}
+      - KAFKA_BOOTSTRAP_SERVERS=${KAFKA_BOOTSTRAP_SERVERS}
+    volumes:
+      - ./services/search/backend:/app
+    networks:
+      - site11_network
+    restart: unless-stopped
+    depends_on:
+      - solr
+      - mongodb
+      - kafka
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
   # Statistics Service
   statistics-backend:
     build: 
@@ -308,13 +359,15 @@ networks:
     driver: bridge
     name: site11_network
 
-volumes:
-  mongodb_data:
-  mongodb_config:
-  redis_data:
-  images_cache:
-  zookeeper_data:
-  zookeeper_logs:
-  kafka_data:
-  minio_data:
-  files_temp:
+# Named volumes are replaced with bind mounts in ./data/ directory
+# volumes:
+#   mongodb_data:
+#   mongodb_config:
+#   redis_data:
+#   images_cache:
+#   zookeeper_data:
+#   zookeeper_logs:
+#   kafka_data:
+#   minio_data:
+#   files_temp:
+#   solr_data: