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_docs/02_document/modules/common_requests_register_user.md

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+# Module: Azaion.Common.Requests.RegisterUserRequest
+
+## Purpose
+Request DTO and FluentValidation validator for user registration (`POST /users`).
+
+## Public Interface
+
+### RegisterUserRequest
+| Property | Type | Description |
+|----------|------|-------------|
+| `Email` | `string` | New user's email |
+| `Password` | `string` | Plaintext password |
+| `Role` | `RoleEnum` | Role to assign |
+
+### RegisterUserValidator
+| Rule | Constraint | Error Code |
+|------|-----------|------------|
+| `Email` min length | >= 8 chars | `EmailLengthIncorrect` |
+| `Email` format | Valid email address | `WrongEmail` |
+| `Password` min length | >= 8 chars | `PasswordLengthIncorrect` |
+
+## Internal Logic
+Validator is auto-discovered by `AddValidatorsFromAssemblyContaining<RegisterUserValidator>()` in `Program.cs`.
+
+## Dependencies
+- `RoleEnum`, `ExceptionEnum` (from `BusinessException`)
+- FluentValidation
+
+## Consumers
+- `Program.cs` `/users` endpoint
+- `UserService.RegisterUser`
+
+## Data Models
+None.
+
+## Configuration
+None.
+
+## External Integrations
+None.
+
+## Security
+Enforces minimum password length of 8 characters and email format validation.
+
+## Tests
+None.