docs: document getDownloadUrl() and fix API-key placeholder

[wei-hai]

What

Documents the previously-undocumented getDownloadUrl() and fixes the API-key placeholder.

Changes

• New "Downloading outputs" section — covers toFile / toBytes, range reads, and getDownloadUrl(). The README previously only showed toFile.
• Auth-table placeholder ck_... → comfyui-... — verified the real key prefix live against staging and prod.

Verified

The download-URL contract was exercised end-to-end against staging and prod via the sibling Python SDK (same low-level endpoint): a self-authorizing signed URL with an expiry, fetchable with no API key (HTTP 200). Hygiene scanner passes. Docs-only; no code behavior change.

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