refactor(route): resolve canonical inputs in plugin boundary

[kubohiroya]

Summary

• Move selection-driven route build input resolution from app bootstrap/runtime mutation API into the route plugin canonical boundary.
• Add the route canonical resolver contract and plugin worker tabular materialization path.
• Keep app worker bootstrap opaque for route payloads and update route docs/tests.

Closes #1504

Verification

• pnpm --filter @hierarchidb/route-plugin test -- src/worker/tabular/tests/unit/resolveIdeGsmRouteBuildRoutes.unit.test.ts src/worker/tests/unit/canonicalBuildAPI.contract.unit.test.ts src/services/resolveRouteCanonicalBuildInput.unit.test.ts
• pnpm --filter @hierarchidb/runtime-worker test -- --runInBand
• pnpm -w turbo run typecheck --filter @hierarchidb/route-api --filter @hierarchidb/route-plugin --filter @hierarchidb/runtime-worker --filter @hierarchidb/app
• git diff --check