fix: make infrastructure host/port configurable via env vars in docker-compose

Replace 7 hardcoded service host/port values with environment variable
references that preserve the existing defaults, so users can override them
via .env to connect to external infrastructure (DB, Redis, Qdrant, Milvus,
Neo4j) without editing docker-compose.yml.

- DB_DRIVER, DB_HOST, DB_PORT
- QDRANT_HOST
- MILVUS_ADDRESS
- REDIS_ADDR
- NEO4J_URI

docker-compose.yml

@@ -73,9 +73,9 @@ services:
       - COS_ENABLE_OLD_DOMAIN=${COS_ENABLE_OLD_DOMAIN:-}
       - GIN_MODE=${GIN_MODE:-release}
       - DISABLE_REGISTRATION=${DISABLE_REGISTRATION:-false}
-      - DB_DRIVER=postgres
-      - DB_HOST=postgres
-      - DB_PORT=5432
+      - DB_DRIVER=${DB_DRIVER:-postgres}
+      - DB_HOST=${DB_HOST:-postgres}
+      - DB_PORT=${DB_PORT:-5432}
       - DB_USER=${DB_USER:-}
       - DB_PASSWORD=${DB_PASSWORD:-}
       - DB_NAME=${DB_NAME:-}
@@ -101,12 +101,12 @@ services:
       - ELASTICSEARCH_USERNAME=${ELASTICSEARCH_USERNAME:-}
       - ELASTICSEARCH_PASSWORD=${ELASTICSEARCH_PASSWORD:-}
       - ELASTICSEARCH_INDEX=${ELASTICSEARCH_INDEX:-}
-      - QDRANT_HOST=qdrant
+      - QDRANT_HOST=${QDRANT_HOST:-qdrant}
       - QDRANT_PORT=${QDRANT_PORT:-6334}
       - QDRANT_COLLECTION=${QDRANT_COLLECTION:-weknora_embeddings}
       - QDRANT_API_KEY=${QDRANT_API_KEY:-}
       - QDRANT_USE_TLS=${QDRANT_USE_TLS:-false}
-      - MILVUS_ADDRESS=milvus:19530
+      - MILVUS_ADDRESS=${MILVUS_ADDRESS:-milvus:19530}
       - MILVUS_COLLECTION=${MILVUS_COLLECTION:-weknora_embeddings}
       - MILVUS_METRIC_TYPE=${MILVUS_METRIC_TYPE:-IP}
       - DOCREADER_ADDR=${DOCREADER_ADDR:-docreader:50051}
@@ -146,14 +146,14 @@ services:
       - OBS_PROXY_DOMAIN=${OBS_PROXY_DOMAIN:-}
       - OLLAMA_BASE_URL=${OLLAMA_BASE_URL:-http://host.docker.internal:11434}
       - STREAM_MANAGER_TYPE=${STREAM_MANAGER_TYPE:-}
-      - REDIS_ADDR=redis:6379
+      - REDIS_ADDR=${REDIS_ADDR:-redis:6379}
       - REDIS_USERNAME=${REDIS_USERNAME:-}
       - REDIS_PASSWORD=${REDIS_PASSWORD:-}
       - REDIS_DB=${REDIS_DB:-}
       - REDIS_PREFIX=${REDIS_PREFIX:-}
       - ENABLE_GRAPH_RAG=${ENABLE_GRAPH_RAG:-}
       - NEO4J_ENABLE=${NEO4J_ENABLE:-}
-      - NEO4J_URI=bolt://neo4j:7687
+      - NEO4J_URI=${NEO4J_URI:-bolt://neo4j:7687}
       - NEO4J_USERNAME=${NEO4J_USERNAME:-neo4j}
       - NEO4J_PASSWORD=${NEO4J_PASSWORD:-password}
       - TENANT_AES_KEY=${TENANT_AES_KEY:-}