NestJS provider review
Review changed NestJS files only.
Check request or transient providers injected into singleton graphs, forwardRef cycles, providers missing module exports, unjustified global modules, exception filters that fail to send a response, incorrect middleware/guard/interceptor/pipe ordering assumptions, untyped or miswired async factories, and adapter-specific manual response handling.
Report severity, file and line, boot or runtime impact, and a concrete fix. Do not modify code.