feat : add Project DTO and service (frontend)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/services/dto/project.ts

@@ -0,0 +1,17 @@
+import type { Client } from './client'
+
+export type Project = {
+    id: number
+    '@id'?: string
+    name: string
+    description: string | null
+    color: string
+    client: Client | null
+}
+
+export type ProjectWrite = {
+    name: string
+    description: string | null
+    color: string
+    client: string | null  // IRI : "/api/clients/1" ou null
+}

frontend/services/projects.ts

@@ -0,0 +1,32 @@
+import type { Project, ProjectWrite } from './dto/project'
+import type { HydraCollection } from '~/utils/api'
+import { extractHydraMembers } from '~/utils/api'
+
+export function useProjectService() {
+    const api = useApi()
+
+    async function getAll(): Promise<Project[]> {
+        const data = await api.get<HydraCollection<Project>>('/projects')
+        return extractHydraMembers(data)
+    }
+
+    async function create(payload: ProjectWrite): Promise<Project> {
+        return api.post<Project>('/projects', payload as Record<string, unknown>, {
+            toastSuccessKey: 'projects.created',
+        })
+    }
+
+    async function update(id: number, payload: Partial<ProjectWrite>): Promise<Project> {
+        return api.patch<Project>(`/projects/${id}`, payload as Record<string, unknown>, {
+            toastSuccessKey: 'projects.updated',
+        })
+    }
+
+    async function remove(id: number): Promise<void> {
+        await api.delete(`/projects/${id}`, {}, {
+            toastSuccessKey: 'projects.deleted',
+        })
+    }
+
+    return { getAll, create, update, remove }
+}