v1.23.1: Eliminate unused asynchronous client path and simplify Cloudflare adapter

Cloudflare Adapter Refactoring & Dead Code Elimination (#207, #208)

• Dead Code Elimination:
  • Removed ~105 lines of unreferenced async_request implementation and unused asyncio import in CloudflareClient.
• Pipeline Consolidation & Backward Compatibility:
  • Unified HTTP request execution into a single, cohesive request() method.
  • Maintained complete backward compatibility by preserving sync_request = request alias.
• Verification:
  • Added unit tests validating method parity and backward compatibility in test_cloudflare_resilience.py.
  • All 365 test cases and 36 subtests pass green across supported runtimes.
  • Reviews approved by @MustermenschAlex and @kuenstlichedummheit-sys.