feat(gcp): Cloud Scheduler in Cloud Explorer

[hectorvent]

Add Cloud Scheduler to the Cloud Explorer (gcp)

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

Backend (packages/api)

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

Frontend (packages/frontend)

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

Adds a small scheduler literal (jobs list with cron/target — generic table is sufficient, no shared panel).
Emulator source: floci-gcp/src/main/java/io/floci/gcp/services/scheduler/