feat: add UserProfileController, DTOs, DocumentListController, and DocumentDownloadController

[AbdulmujibOladayo]

Adds self-contained NestJS modules for user profile management and document access:

• UserProfileController: GET/PATCH /api/module/users/me protected by JwtAuthGuard
• UpdateProfileDto and UserResponseDto with class-validator decorators and Exclude on sensitive fields
• DocumentListController: paginated GET /api/module/documents with status filter
• DocumentDownloadController: streaming GET /api/module/documents/:id/download with owner and file-existence checks

closes #463
closes #464
closes #465
closes #466

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