cleaned up the LLM providers.

src/constants/llmConstants.ts

@@ -0,0 +1,10 @@
+/**
+ * Constants related to LLM providers and API interactions
+ */
+
+// Protocol markers and special character combinations used in LLM communications
+export const LLM_PROTOCOL = {
+  SSE_DATA_PREFIX: 'data: ',
+  SSE_DONE_MARKER: '[DONE]',
+  SEGMENT_SEPARATOR: '\n\n'
+} as const;