**refactor: streamline initializeBrainy embedding configuration and cleanup code style**

### Changes:
- Removed conditional configuration for `USE_SIMPLE_EMBEDDING` as Universal Sentence Encoder is now the sole embedding option.
- Updated comments to reflect the exclusive use of TensorFlow.js for embedding functionality.
- Cleaned up unnecessary blank lines and whitespace for improved code readability.

### Purpose:
Simplified the `initializeBrainy` function by consolidating embedding configuration and eliminating outdated options. This refinement aligns with the project's transition to TensorFlow-based embeddings and improves code clarity.

cloud-wrapper/src/services/brainyService.ts

@@ -45,11 +45,8 @@ export async function initializeBrainy(): Promise<BrainyData> {
       break;
   }
 
-  // Configure embedding options
-  if (process.env.USE_SIMPLE_EMBEDDING === 'true') {
-    // Use simple embedding (faster but less accurate)
-    config.useSimpleEmbedding = true;
-  }
+  // Note: Universal Sentence Encoder is now the only embedding option
+  // TensorFlow.js is required for embedding to work
 
   // Configure HNSW index parameters if provided
   if (process.env.HNSW_M) {