DMR from django-ninja

Overview

Migrate django-ninja / ninja-extra transport layer to django-modern-rest incrementally. Keep business logic unchanged unless user explicitly asks.

Required docs (always reference first):

• DMR LLM docs: https://django-modern-rest.readthedocs.io/llms-full.txt
• Local map: references/ninja-to-dmr-map.md

Migration Policy

• Default mode: strict transport parity.
• Preserve by default: paths, methods, request/response schemas, status codes, headers, auth semantics, throttling semantics.
• If user approves drift (for example switching to DMR-native error format/status), stop forcing legacy behavior and document this as approved drift.
• Never mix implicit drift: every intentional mismatch must be explicitly listed.
• Do not preserve Ninja infrastructure internals as implementation strategy. Keep observable contracts, but realize them with DMR + project-native libraries.