fix: address code review issues and cleanup QA reports

Code review fixes:
- Add error logging to LlmProviderAdminController.testProvider catch block
- Use atomic increment operations in TokenBudgetService.updateUsage to prevent race conditions
- Update test expectations for atomic increment pattern

Cleanup:
- Remove obsolete QA automation reports

All 1169 tests passing.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/token-budget/token-budget.service.spec.ts

@@ -112,9 +112,9 @@ describe("TokenBudgetService", () => {
       expect(mockPrismaService.tokenBudget.update).toHaveBeenCalledWith({
         where: { taskId: mockTaskId },
         data: {
-          inputTokensUsed: 60000,
-          outputTokensUsed: 40000,
-          totalTokensUsed: 100000,
+          inputTokensUsed: { increment: 10000 },
+          outputTokensUsed: { increment: 10000 },
+          totalTokensUsed: { increment: 20000 },
           budgetUtilization: expect.closeTo(0.667, 2),
         },
       });