Fix file naming convention and property visibility

- Rename ThinkingTagExtractor.ts to thinkingTagExtractor.ts (follow lowercase convention in llm/)
- Rename ThinkingTagExtractor.vitest.ts to thinkingTagExtractor.vitest.ts
- Update imports in Vllm.ts and test file
- Change thinkingOpenTag/thinkingCloseTag from protected to private

Co-authored-by: AyRickk <[email protected]>

Author: Copilot

core/llm/ThinkingTagExtractor.vitest.ts

@@ -1,7 +1,7 @@
 import { ChatMessage, Chunk, CompletionOptions, LLMOptions } from "../../index.js";
 
 import { LlmApiRequestType } from "../openaiTypeConverters.js";
-import { ThinkingTagExtractor } from "../ThinkingTagExtractor.js";
+import { ThinkingTagExtractor } from "../thinkingTagExtractor.js";
 import OpenAI from "./OpenAI.js";
 
 // vLLM-specific rerank response types
@@ -66,8 +66,8 @@ class Vllm extends OpenAI {
   static providerName = "vllm";
 
   // vLLM-specific options for thinking tag extraction
-  protected thinkingOpenTag?: string;
-  protected thinkingCloseTag?: string;
+  private thinkingOpenTag?: string;
+  private thinkingCloseTag?: string;
 
   // Override useOpenAIAdapterFor to NOT include "streamChat".
   // vLLM uses the reasoning_content field for thinking output (via vLLM's reasoning parser),

core/llm/llms/Vllm.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { ThinkingTagExtractor } from "./ThinkingTagExtractor";
+import { ThinkingTagExtractor } from "./thinkingTagExtractor";
 
 describe("ThinkingTagExtractor", () => {
   describe("basic functionality", () => {