feat: refactor ConstructivePreset into createConstructivePreset() factory with feature flag options

[pyramation]

Summary

Converts the static ConstructivePreset object into a createConstructivePreset(options?) factory function. Each optional boolean flag in ConstructivePresetOptions maps 1-to-1 with the database_settings / api_settings tables (from constructive-db#1060), controlling whether its corresponding Graphile plugin preset is included in the generated config.

Key changes:

• New ConstructivePresetOptions interface with 9 flags: enableAggregates, enablePostgis, enableSearch, enableDirectUploads, enablePresignedUploads, enableManyToMany, enableConnectionFilter, enableLtree, enableLlm
• Factory conditionally builds the extends array, connectionFilterOperatorFactories, disablePlugins, and schema options based on which flags are enabled
• Server wiring: buildPreset() now passes databaseSettings directly to createConstructivePreset() — all flags flow through, replacing the previous approach where only enableAggregates was handled manually
• Backwards compat: export const ConstructivePreset = createConstructivePreset() preserves the static import for existing consumers (defaults match previous behavior: everything on except aggregates and LLM)

This completes the end-to-end feature flag wiring: database_settings row → server reads → createConstructivePreset(settings) → each plugin conditionally included/excluded.

Review & Testing Checklist for Human

• Verify DatabaseSettings property names match ConstructivePresetOptions — the factory receives databaseSettings directly as options via spread ({ ...DEFAULTS, ...options }). If any property name differs (e.g., enableDirectUploads vs enable_direct_uploads), that flag silently falls back to the default. Check graphql/server/src/types.ts to confirm alignment.
• Verify operatorFactories gating logic is correct — operator factories are only built when enableConnectionFilter is true AND the satellite feature (search/postgis/ltree) is also enabled. Previously these were always included. If connection filter is disabled, no operator factories or disablePlugins are set — confirm the app works correctly with PgConditionArgumentPlugin still active in that case.
• Side-effect timing of factory helpers — createBucketNameResolver(), createEnsureBucketProvisioned(), getAllowedOrigins(), getPresignedUrlS3Config are now called per-createConstructivePreset() invocation (once per tenant) rather than once at module load. Verify these are safe to call multiple times / return fresh-but-equivalent results.
• Deploy to a test environment and verify: (1) default preset works identically to before (no regressions), (2) setting enable_aggregates = true in database_settings actually exposes aggregates in the GraphQL schema, (3) setting a feature to false actually removes its types/fields from the schema.

Notes

• No unit tests for the factory function yet — tracked in constructive-planning#823.
• enableLlm is reserved/no-op (no plugin exists yet).
• operatorFactories is typed as unknown[] — matches the existing pattern but is worth tightening in a follow-up.

Link to Devin session: https://app.devin.ai/sessions/94a2728a9c414500bead29cbbc829c15
Requested by: @pyramation

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