✨ Add testimonials page with personality-styled cards (Story 2.6)

- Add testimonials table migration with personality enum
- Create Testimonial model with HasTranslations trait
- Add TestimonialSeeder with 4 test testimonials
- Create TestimonialController and TestimonialResource
- Add useFetchTestimonials composable
- Create TestimonialCard component with personality-based styling
- Add temoignages.vue page with loading/error states
- Add testimonials translations in FR/EN

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/app/composables/useFetchTestimonials.ts

@@ -0,0 +1,15 @@
+import type { TestimonialsResponse } from '~/types/testimonial'
+
+export function useFetchTestimonials() {
+  const config = useRuntimeConfig()
+  const { locale } = useI18n()
+
+  return useFetch<TestimonialsResponse>('/testimonials', {
+    baseURL: config.public.apiUrl as string,
+    headers: {
+      'X-API-Key': config.public.apiKey as string,
+      'Accept-Language': locale.value,
+    },
+    transform: (response) => response,
+  })
+}