fix(pricing): alias grok-proxy to Grok Build

[robinebers]

TL;DR

Alias the Grok CLI log slug grok-proxy to grok-build-0.1 so recent Grok Build usage shows up in spend tiles and Total Spend.

What was happening

• GrokLogUsageScanner attributes inference_done rows via the last model id seen for that PID.
• Unpriced models are dropped from every spend total (warning triangle only).
• grok-build and grok-code-fast-1 already alias to grok-build-0.1. Recent Grok Build CLI sessions log grok-proxy instead, so Today/Yesterday (and Total Spend for those days) went empty while Weekly quota still worked. Older grok-build days still filled Last 30 Days.

What this changes

• Add supplement alias grok-proxy → grok-build-0.1 (same rates as grok-build: $1 input / $2 output per million).
• Extend testGrokCLIModelAliases so grok-proxy resolves to the same rates as grok-build-0.1.
• Bump updated_at so installed apps pick the feed up within about an hour. No app release needed.

Heads-up

• Grok 4.5/4.6 sessions still log those ids, not grok-proxy. This only affects Grok Build CLI users whose logs switched slugs.
• If grok-proxy ever becomes a generic proxy id for other models, this alias would underprice those rows.

Tests

• Supplement JSON/alias validation
• PricingBundledResourceTests/testGrokCLIModelAliases

Fixes #1119

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