feat(core): support configurable dock renderers

[dvcolomban]

What changed

• Add configurable dock renderer registration and thread the registrations through hosted and static DevTools setups.
• Preserve the generic JSON-render author API and optional schema pass-through.
• Add coverage for renderer merging and server/static renderer resolution.
• Update the affected public API snapshots.

Why it changed

This lets consumers supply their own dock renderer implementation without coupling DevTools to a downstream catalog. The generic JSON-render API depends on the companion Devframe API change, so this PR remains a draft until that change is merged and released.

Related to devframes/devframe#267 and depends on devframes/devframe#273.
Closes #537.

Validation

• pnpm --filter @vitejs/devtools-kit build
• pnpm --filter @vitejs/devtools build
• pnpm exec vitest run -u --project test exports.test.ts (with TSNAPI_ALLOW_BREAKING=1 for the intentional public type change)

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commit: 121656d