fix: filter relationship SQL by nspname, not regnamespace::text

[hsusul]

Summary

• Fixes Relationship column lists are null for dotted/mixed-case schemas #1147: dotted / mixed-case schemas made connamespace::regnamespace::text miss schemaFilter, leaving FK columns / referenced_columns null for typegen.
• Filter via pg_namespace.nspname (and oid subquery in views key deps); drop the redundant lateral regnamespace filter now covered by the outer ns1.nspname predicate.
• Adds relationship list regression tests for "odd.schema" and "MySchema".

Test plan

• npx vitest run test/index.test.ts -t "relationships list includes columns"
• Generate types for a schema with a dot in the name and confirm FK relationships include column names