v3.6.0 — pibox-zai v0.8.0 + LiteLLM client-header forwarding +
Makefile autodetect fix

Bumps pibox-zai to v0.8.0 (riding on aicodebox v0.7.0). Brings the
full set of nine `x-aicodebox-*` per-request agent knobs onto the
OpenAI-compatible endpoint — workspace, continue, append-system-prompt,
json-schema, resume, no-tools, tools-allowlist, extra-args,
timeout-seconds — reachable from any OpenAI SDK via `extra_headers`.

Enables `forward_client_headers_to_llm_api: true` in LiteLLM so those
headers actually traverse the proxy to pibox-zai. Authorization stays
on the LiteLLM side (upstream gets its own configured key).

Fixes Makefile's autodetect ifeq blocks to include the v3.4.0 vllm /
vllm-cuda / audiolla / audiolla-cuda profiles so `make run-bg`
(and `make restart`) actually starts them when their .env flag is set.

See CHANGELOG.md for the full details.