feat: add DataRealtime node type definition

[pyramation]

Summary

Adds the DataRealtime node type definition to the node-type-registry, corresponding to the data_realtime.sql generator that was added in constructive-db (PRs #1082/#1085/#1086). This registers the type so it appears in metaschema_public.node_type_registry at deploy time.

What it defines:

• DataRealtime — category data, slug data_realtime
• parameter_schema with two properties:
  • operations: which DML operations to track (default: all three)
  • subscriber_table_name: optional override for the subscriber table name (no static default — the SQL generator computes {source_table}_subscriber at runtime)

Notable design choice: Unlike most other Data* types, DataRealtime has no column-ref properties. This is intentional — the SQL generator dynamically introspects source table SELECT policies from the registry to discover which columns to create on the subscriber table, rather than declaring them statically here.

Review & Testing Checklist for Human

• Verify parameter_schema matches what data_realtime.sql actually reads from the data jsonb — specifically that operations and subscriber_table_name are the correct keys and types
• After merging, regenerate the SQL seed in constructive-db (pnpm generate in packages/node-type-registry, then pgpm package in pgpm-modules/metaschema-schema) to populate the registry row

Notes

Related PRs across other repos in this batch:

• constructive-db: skills updates (node-type-registry + data-modules installed copies)
• constructive-private-skills: DataRealtime section added to data-modules skill
• constructive-skills: Realtime Subscriptions section added to features catalog

Link to Devin session: https://app.devin.ai/sessions/19485cf5cc58416a9f86068563d512f5
Requested by: @pyramation

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