fix(sites): remove deployment metrics card and bump immutable audit override

[HarshMN2345]

Summary

• sites.getUsage() is being removed from the SDK in appwrite/sdk-for-console#105, part of the same usage-endpoint removal covered by fix: remove remaining tabs/routes and clear high-severity audit #3134.
• That cleanup missed one live consumer: the inline build-metrics card (deploymentMetrics.svelte) rendered on the site deployments page, which called sites.getUsage() directly (separate from the top-level Usage tab already removed).
• Removes the card and its now-dead component file.
• Also bumps the immutable override from ^5.1.5 to ^5.1.8 (pulled in via sass) to clear a bun audit --audit-level high failure — two DoS advisories, pre-existing on main, unrelated to the sites fix but needed for CI to pass.

Test plan

• bun audit --audit-level high — 0 vulnerabilities
• bun run check — 0 errors
• bun run lint — 0 errors
• bun run test:unit — 239 passed
• Site deployments page renders correctly without the metrics card

[greptile-apps]

Greptile Summary

This PR removes the site deployment metrics card that used a deprecated SDK endpoint. The main changes are:

• Removes the metrics card from the site deployments page.
• Deletes the card's self-contained Svelte component.
• Updates the immutable dependency override and lockfile resolution.

Confidence Score: 5/5

This looks safe to merge.

• The deleted component has no remaining imports or render sites.
• The deprecated sites.getUsage() call is removed.
• The dependency override and resolved lockfile version are consistent.
• No blocking issues were found in the updated code.

Important Files Changed

Filename	Overview
src/routes/(console)/project-[region]-[project]/sites/site-[site]/deployments/+page.svelte	Removes the metrics component import and render site while preserving the deployment list layout.
src/routes/(console)/project-[region]-[project]/sites/site-[site]/deployments/deploymentMetrics.svelte	Deletes the self-contained component that called the deprecated sites.getUsage() endpoint.
package.json	Raises the immutable override from ^5.1.5 to ^5.1.8.
bun.lock	Updates the override and resolves immutable to version 5.1.9.

_{Reviews (2): Last reviewed commit: "Merge branch 'fix-audit-immutable' into ..." | Re-trigger Greptile}