Project — Adopt Domain Exceptions & Unified Error Handling

## Description
Refactor **project** module to use domain exceptions end-to-end.

## What is expected
- Map infra errors; remove legacy error shapes.

## Scope
- Controllers: `src/modules/project/presentation/controllers/*`
- Services/use-cases: `src/modules/project/*`

## Tests
- 404/409/400 with standard error body.

## Acceptance criteria
- Only domain exceptions used; tests green.
