feat(gcp): Cloud Run in Cloud Explorer

[hectorvent]

Add Cloud Run to the Cloud Explorer (gcp)

The gcp emulator implements Cloud Run (~0 operations). The UI does not surface it yet.

Backend (packages/api)

• src/cloud-spi/containersSchema.ts — containersSchemaFor('gcp') (model: src/cloud-spi/storageSchema.ts)
• src/adapter-gcp/GcpCloudRunAdapter.ts implements CloudServiceAdapter + GcpCloudRunAdapter.test.ts (model: src/adapter-aws/AwsStorageAdapter.ts)
• Register new GcpCloudRunAdapter() in src/cloudProxy.ts; add services.push({...}) + schema() fallback in src/service/CloudProxyService.ts

Frontend (packages/frontend)

• Verify nav shows Cloud Run for gcp and normalizeService() handles the literal (pages/CloudExplorerPage.tsx)
• Confirm generic DynamicResourceView rendering; add a service === '...' panel only if deep UX is needed

Acceptance

• Cloud Run appears in the gcp nav; list / create / delete / inspect work against the local emulator
• Adapter unit test passes

Depends on #73 (new containers service type).
Emulator source: floci-gcp/src/main/java/io/floci/gcp/services/run/