refactor(misc): drop services_public from graphile plugin docs, compose files, csv-to-pg test

[pyramation]

Summary

Miscellaneous slice of the hard migration off services_public. The jobs/knative-job-service migration that was originally here has been reverted to main — it must land together with the server-default flip in the core PR #1447, which now owns it.

• graphile-llm (chat.ts, embedder.ts, plugins/llm-module-plugin.ts, types.ts, README.md): doc references to the llm_module source table now say constructive_routing_public.api_modules. No code path names the schema.
• graphile-settings/custom-inflector.ts: _schemaPrefix doc example → constructive_routing_public_api -> constructiveRoutingPublicApi; the inflector itself already returns '' for every schema.
• docker-compose.jobs.yml / docker-compose.local-email.yml: API_EXPOSED_SCHEMAS → metaschema_public,constructive_routing_public,constructive_auth_public; API_META_SCHEMAS additionally gets catalog + apps. Routing alone is exposed on purpose: exposing catalog and routing together trips PostGraphile with Attempted to add a second codec named 'apis', since the custom inflector strips schema prefixes and both schemas have an apis table.
• packages/csv-to-pg: services_public was only an arbitrary example schema name in export.test.ts; renamed to app_public with snapshots re-recorded.

Not changed: __fixtures__/output/** is generated codegen output that still contains schemas/services_public.ts — it belongs to the codegen regeneration follow-up, not a hand edit.

Link to Devin session: https://app.devin.ai/sessions/33ae06cfdc414ea7b15c9795abc0dcb3
Requested by: @pyramation

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