use env variable in config

Signed-off-by: Arnesh Dadhich <arneshdadhich0011@gmail.com>

Author: isuniverseok

src/server/api/go/configs/config.yaml

@@ -54,4 +54,4 @@ artifact:
   maxUploadSizeBytes: ${ARTIFACT_MAX_UPLOAD_SIZE_BYTES}  # Default 16MB (16 * 1024 * 1024 bytes)
 
 embedding:
-  taskVectorDim: 1536  
+  taskVectorDim: ${TASK_VECTOR_DIMENSION}