Fix Codex WS proxy (Issue #86), LiteLLM metrics, and backend forwarding

Fix tool_result ordering: no stray user message between tool_calls and tool

Fix streaming tool calls, compressed request bodies, beacon field names; bump to 0.5.13

Fix Windows Unicode crash and Bedrock Claude 4.6 model IDs

Fix ruff format for litellm, wrap, test_scanner

fix(bedrock): add EU/AP region support with graceful fallback

Commit message:

Fix proxy backend bugs: env vars, tool forwarding, and provider support

Fixing the ruff linting

Update anyllm.py

Update anyllm.py

Update anyllm.py

Adding any-llm as a backed provider

Add LiteLLM backend routing for OpenAI endpoint and Magika content detection

Use AWS API to dynamically fetch Bedrock inference profiles

Add OpenRouter backend support with provider registry pattern

Fix Bedrock backend: use inference profiles for Claude 4+ models

Add cloud provider support via LiteLLM backend