perf: scope registry data to each page

[777genius]

Summary

• keep the complete reviewed registry server-side at build time
• prerender catalog, client, and plugin-specific JSON projections
• preserve live Discovery and Security augmentation on catalog surfaces
• add route payload budgets and projection contracts

Measured impact

• plugin detail HTML gzip: 90.5 KB -> 58.5 KB
• download HTML gzip: 67.2 KB -> 55.5 KB
• home HTML gzip: 95.2 KB -> 84.1 KB

Verification

• pnpm test:registry (32 passed)
• pnpm generate
• playwright test --workers=3 (48 passed)
• pnpm lint (0 errors)
• focused Go landing contract

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Review configuration:

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: c7d0a8d8-93de-4152-9bda-afdd89dda212

📥 Commits

Reviewing files that changed from the base of the PR and between b7ec270 and 7dd279a.

📒 Files selected for processing (15)

• landing/composables/useRegistry.ts
• landing/nuxt.config.ts
• landing/pages/agents/[client].vue
• landing/pages/index.vue
• landing/pages/plugins/[slug].vue
• landing/pages/plugins/community.vue
• landing/pages/plugins/index.vue
• landing/server/api/registry/catalog.get.ts
• landing/server/api/registry/client/[client].get.ts
• landing/server/api/registry/empty.get.ts
• landing/server/api/registry/plugin/[slug].get.ts
• landing/tests/browser/payload-scoping.spec.ts
• landing/tests/registry.test.ts
• landing/utils/registryProjection.ts
• repotests/landing_contract_integration_test.go

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