fix(distributed): close staging conformance gaps

Separate hosts cannot use frontend paths directly. Stage the remaining path-bearing requests and the original model config.

Async quantization cleanup can span replicas and requests. Persist each cleanup phase so failures retry without fetching completed output twice.

Reject root aliases and untrusted export entries before they can mutate frontend or worker files.

The compiled cluster suite now exercises these paths through both public routes and the authenticated peer relay.

Assisted-by: Codex:GPT-5 [apply_patch] [exec_command]
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