feat(tests): update Alpaca API tests to include range parameters and improve stock database cleanup

- Modified Alpaca Historical Bars tests to include range parameters in API requests.
- Updated test descriptions for clarity.
- Added cleanup step to delete test ticker after verification in stock database tests.
- Adjusted Vitest configuration to exclude test files from coverage.

app/lib/__tests__/openrouter.test.ts

@@ -10,7 +10,8 @@ describe("OpenRouterClient", () => {
   it("should have default free models list", () => {
     const client = new OpenRouterClient("test-api-key");
     const models = client.getFreeModels();
-    expect(models).toContain("google/gemini-2.0-flash-exp:free");
+    expect(models.length).toBeGreaterThan(0);
+    expect(models).toContain("openai/gpt-oss-120b:free");
   });
 
   it("should have available model providers", () => {