refactor: migrate all quote() usages to quoteIdentifier and remove deprecated methods

- Replace all QuoteUtils.quote() usages with QuoteUtils.quoteIdentifier()
- Remove deprecated needsQuotes() and quote() methods from quote-utils.ts
- QuoteUtils now only exports: escape, escapeEString, formatEString, needsEscapePrefix, quoteIdentifier, quoteQualifiedIdentifier

This completes the migration to PostgreSQL-accurate identifier quoting.

Co-Authored-By: Dan Lynch <[email protected]>

Author: devin-ai-integration[bot]