feat: L'Ami Fiduciaire V1.0.0 — full codebase with Story 0.1 complete

Initial commit of the L'Ami Fiduciaire SaaS platform built on Laravel 12,
Vue 3, Inertia.js 2, and Tailwind CSS 4.

Story 0.1 (rename folders to declarations in database) is implemented and
code-reviewed: migration, rollback, and 6 Pest tests all passing.

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

resources/js/composables/useInitials.ts

@@ -0,0 +1,18 @@
+export type UseInitialsReturn = {
+    getInitials: (fullName?: string) => string;
+};
+
+export function getInitials(fullName?: string): string {
+    if (!fullName) return '';
+
+    const names = fullName.trim().split(' ');
+
+    if (names.length === 0) return '';
+    if (names.length === 1) return names[0].charAt(0).toUpperCase();
+
+    return `${names[0].charAt(0)}${names[names.length - 1].charAt(0)}`.toUpperCase();
+}
+
+export function useInitials(): UseInitialsReturn {
+    return { getInitials };
+}