✨ 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>

api/app/Models/Testimonial.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Models;
+
+use App\Traits\HasTranslations;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Testimonial extends Model
+{
+    use HasTranslations;
+
+    protected $fillable = [
+        'name',
+        'role',
+        'company',
+        'avatar',
+        'text_key',
+        'personality',
+        'project_id',
+        'display_order',
+        'is_active',
+    ];
+
+    protected $casts = [
+        'is_active' => 'boolean',
+    ];
+
+    public function project(): BelongsTo
+    {
+        return $this->belongsTo(Project::class);
+    }
+
+    public function scopeActive(Builder $query): Builder
+    {
+        return $query->where('is_active', true);
+    }
+
+    public function scopeOrdered(Builder $query): Builder
+    {
+        return $query->orderBy('display_order');
+    }
+}