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Add @electric-sql/pglite so the server can run without an external Postgres instance. When DATABASE_URL is not set, the server auto-creates an embedded PGlite database in ./data/pglite with schema push on startup. - Add createPgliteDb() alongside the existing createDb() - Make DATABASE_URL optional in server config - Update drizzle config to glob schema files - Update migrate script to support both Postgres and PGlite - Add data/ to .gitignore for local PGlite storage Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>