feat: retry button for orchestrator errors + explicit client timeout

Extract orchestrator inner loop into _doOrchestrate() so the retry button
can re-run without re-adding the user message to DOM or history — same
pattern as the existing chat retry.

Also set AsyncOpenAI(timeout=settings.timeout_local) so slow remote models
(OpenRouter/DeepSeek) get the same 300s budget as local chat calls instead
of the SDK default which varies by connection.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cortex/openai_orchestrator.py

@@ -405,7 +405,7 @@ def _build_client(
     base_url = api_url.rstrip("/")
     if host_type == "openwebui":
         base_url = base_url + "/api"
-    client = AsyncOpenAI(base_url=base_url, api_key=api_key)
+    client = AsyncOpenAI(base_url=base_url, api_key=api_key, timeout=settings.timeout_local)
     if model_cfg.get("tools") is False:
         active_tools = []
     else: