[Docs] Correct provider setup and inference guidance

[roomote-community]

​Created by Roomote. View the task or mention @roomote for follow-up asks.

What changed

Corrected public setup guidance across inference, compute, source-control, communications, integration, and cookbook pages. The inference docs now accurately describe model seeding and deletion, credential validation, environment-based setup, provider discovery, authentication, presets, and subscription limits.

Why this change was made

Several operator-facing details had drifted from the current implementation and provider behavior. These corrections keep setup and troubleshooting guidance aligned with the shipped product.

Impact

Operators get more precise configuration and failure guidance without any runtime behavior change. The docs build and broken-link checks pass; rendered screenshot capture was unavailable because the delegated proof runtime could not start at the configured task depth.

[roomote-community]

No code issues found. See task

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