refactor: migrate all camelize() calls to declarative toCamelCase/toPascalCase API

[pyramation]

Summary

Replaces all camelize() calls across the monorepo with inflekt's new declarative API (toCamelCase / toPascalCase), eliminating the confusing boolean second parameter. Also consolidates remaining duplicated case-transformation logic to use inflekt as the single source of truth.

Mapping applied:

• camelize(x, true) → toCamelCase(x) (36 call sites)
• camelize(x) / camelize(x, false) → toPascalCase(x) (5 call sites)

Files changed (excluding lockfile):

• graphile/graphile-settings/src/plugins/custom-inflector.ts — 14 call sites migrated
• graphql/query/src/query-builder.ts — 11 call sites migrated
• graphql/query/src/ast.ts — 3 call sites migrated
• graphql/query/src/generators/naming-helpers.ts — 2 call sites migrated + replaced inline screaming-snake regex with toScreamingSnake from inflekt
• graphql/codegen/src/cli/shared.ts — 1 call site migrated + simplified camelizeArgv (removed redundant hyphen pre-processing since toCamelCase handles hyphens natively)
• pgpm/export/src/graphql-naming.ts — 3 call sites migrated
• pgpm/export/__tests__/export-parity.test.ts — 1 call site (test helper, not assertion)
• pgpm/export/__tests__/cross-flow-parity.test.ts — 1 call site (test helper, not assertion)
• pgpm/export/package.json — bumped inflekt ^0.3.3 → ^0.5.1
• postgres/pg-codegen/src/codegen/codegen.ts — replaced local toPascalCase copy with import from inflekt
• postgres/pg-codegen/package.json — added inflekt as dependency

Behavioral note: The new functions handle both - and _ delimiters, whereas the old camelize only handled _. An audit of all call sites confirmed inputs are always snake_case, so this is safe.

Companion PR: constructive-io/dev-utils#72 (merged — inflekt@0.5.1 published with camelize removed entirely).

Updates since last revision

• Bumped inflekt to ^0.5.1 across all 5 consuming packages (graphile-settings, graphql/query, graphql/codegen, pgpm/export, postgres/pg-codegen) and regenerated lockfile to resolve the newly published version.
• Removed local toPascalCase from pg-codegen/codegen.ts — replaced with import { toPascalCase } from 'inflekt' and added inflekt as a dependency to pg-codegen.
• Simplified camelizeArgv in shared.ts — the old code did key.replace(/-/g, '_') before calling toCamelCase, but toCamelCase already handles hyphens natively, so the wrapper was reduced to just toCamelCase.
• Replaced inline screaming-snake regex in toOrderByEnumValue — now uses toScreamingSnake from inflekt instead of an inline .replace(/([a-z0-9])([A-Z])/g, '$1_$2').toUpperCase().

Review & Testing Checklist for Human

• Verify toScreamingSnake equivalence in toOrderByEnumValue: The old inline regex ([a-z0-9])([A-Z]) only inserts _ at lower→upper transitions, while inflekt's toScreamingSnake inserts _ before every uppercase letter. These behave identically for typical camelCase field names (displayName, createdAt) but differ for consecutive-uppercase inputs (e.g. "ABCField" → old: "ABC_FIELD", new: "A_B_C_FIELD"). Verify your schema field names don't include such patterns.
• Verify camelizeArgv simplification: Confirm that toCamelCase("schema-file") produces "schemaFile" — same as the old path of "schema-file" → "schema_file" → toCamelCase → "schemaFile". Should be identical but worth a spot-check with CLI args.
• Verify PascalCase mapping in pg-codegen/codegen.ts: The local toPascalCase used [_-](\w) while inflekt's uses [-_](.). Both handle underscore and hyphen; the difference is \w vs . for the captured char. Should be equivalent for identifier-safe inputs — verify pg table names don't contain special chars.
• Run the PostGraphile schema against a real database to confirm inflector output hasn't changed (field names, query names, mutation names should all be identical).

Notes

• No test assertions were modified — only test helper utilities that convert PG rows to camelCase.
• Requires inflekt@0.5.1 (published, companion dev-utils PR already merged).
• The camelizeArgv function name in shared.ts was intentionally kept as-is — it's a local function name describing what it does, not an inflekt API reference.

Link to Devin session: https://app.devin.ai/sessions/e3dd5ed7753043bd8d2166793364cd42
Requested by: @pyramation

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