fix(deploy): create standalone server to eliminate SIGTERM

fix(deploy): bind server to 0.0.0.0 for Railway

fix(deploy): correct circular reference in root index.js

fix(deploy): regenerate package-lock.json with all dependencies

fix(deploy): flatten project structure to eliminate nested npm commands

feat(deploy): add railway config to fix startup

fix(backend): implement non-blocking server startup

feat(backend): add debug logging to items route

refactor(backend): rename server to index to clear cache

fix(backend): correct query syntax for neon

fix(backend): correct database initialization call

fix(backend): create missing error handler module

feat(backend): add database connection logging

fix(backend): process audio in memory

fix(frontend): use https for api calls