feat(service-map): show Google Cloud as the platform for services on GCP

[JeremyFunk]

Stacked on #1336.

Services on Google Cloud did not read as Google Cloud on the service map:

• Cloud Run / Cloud Functions: the gcpDetector our GCP docs recommend sets faas.name, so the classifier called them lambda and drew the AWS Lambda icon.
• GKE: drawn as plain Kubernetes.

Change:

• cloud.provider = gcp classifies as a new gcp platform, checked before the Lambda and Kubernetes rules (API classifier and the local-ui copy).
• Node shows the Google Cloud mark with a "Google Cloud" tooltip; platform colour mode has a Google Cloud colour and legend entry (legend now uses proper labels instead of capitalize).
• GoogleCloudIcon moved from apps/web into @maple/ui icons (re-exported from @/components/icons, so existing imports keep working).

Tested: local-ui classifier test (Cloud Run + GKE cases), packages/ui service-map tests; rendered on /lab/bench/service-map in platform colour mode (icon, tooltip, legend).

---

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[maple-review-bot]

Maple review

🟢 Confidence 8/10 · likely safe to merge
Every consumer of the ServicePlatform literal was read and updated with it; only the cloud API's classifier branch itself has no test.
_{quality 100/100 · no findings · tests partial · risk medium}

Adds a gcp platform to the service map, classified from cloud.provider = gcp ahead of the Lambda and Kubernetes rules, with the Google Cloud mark, colour and legend entry. The platform union is updated at every consumer, so it is safe to merge.

• gcp platform added to the classifier in the API route and local-ui copy
• ServicePlatformLiteral and the web type gain gcp
• Google Cloud icon, colour, and legend entry on the node/canvas
• GoogleCloudIcon/GoogleCloudMonoIcon moved into @maple/ui and re-exported

What was checked

• Every consumer of the platform literal: PLATFORM_COLORS, node switch, legend, 3D machineKind, web type union
• GoogleCloudIcon/GoogleCloudMonoIcon still resolve for existing @/components/icons importers after the move
• Both classifiers updated (query-engine.http.ts:263, use-local-service-map.ts:111); no third copy of the rule exists

_{539b170 · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}

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[maple-review-bot]

Maple review

🟢 Confidence 9/10 · safe to merge
Contained; both classifier copies and the icon move agree, and the local-ui test pins the new order. The GCP fix assumes gcpDetector emits cloud.provider.
_{quality 100/100 · no findings · tests partial · risk medium}

Adds a gcp platform to the service map, checked before the Lambda and Kubernetes rules, with a Google Cloud icon, colour and legend entry. Small, consistent across the API and local-ui classifiers; safe to merge.

• toServicePlatformRow and classifyPlatform classify cloud.provider = gcp before Lambda and Kubernetes
• ServicePlatform gains gcp in the domain wire schema and both TypeScript unions
• GoogleCloudIcon moved to @maple/ui, re-exported from @/components/icons
• Platform legend uses fixed labels; PLATFORM_COLORS gains a Google Cloud colour

What was checked

• Both classifier copies apply the gcp rule in the same position (query-engine.http.ts:263, use-local-service-map.ts:111)
• google-cloud.tsx resolves ./icon in packages/ui; no remaining import of the old @/components/icons/google-cloud path
• Every platform switch is exhaustive (satisfies Record<ServicePlatform | "unknown", string>, getPlatformIcon), so the new member cannot silently fall through

_{d0db410 · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}

[JeremyFunk]

Folded into #1335 (commit b5378d6): the fix belongs with the docs that recommend gcpDetector.