### Scope
Admin routes directories D to N.
### What
Move inline OAS response schema declaration under their respective class declarations in order to expose them through `#/components/schemas`. Replace inline OAS response schema with a `$ref` reference pointing to the newly declared schema.
### Why
Having response declared as its own "named" schema will allow OAS code generators to output typed entities/DTO that can be consumed without having to reference the route/operation.
### How
Declare a new @schema JSDoc for each "Res" class used to parse and validate request body. Move the current inline requestBody to the new @schema.
### Test
- Ran OAS validator.
- Ran docs build script.
Expect no visible changes to the documentation.
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