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>

app/Models/ClientContact.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Spatie\Activitylog\LogOptions;
+use Spatie\Activitylog\Traits\LogsActivity;
+
+class ClientContact extends Model
+{
+    /** @use HasFactory<\Database\Factories\ClientContactFactory> */
+    use HasFactory, LogsActivity;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var list<string>
+     */
+    protected $fillable = [
+        'client_id',
+        'full_name',
+        'job_title',
+        'email',
+        'phone',
+        'is_principal',
+    ];
+
+    /**
+     * Get the attributes that should be cast.
+     *
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'is_principal' => 'boolean',
+        ];
+    }
+
+    /**
+     * Get the client that owns the contact.
+     *
+     * @return BelongsTo<Client, $this>
+     */
+    public function client(): BelongsTo
+    {
+        return $this->belongsTo(Client::class);
+    }
+
+    public function getActivitylogOptions(): LogOptions
+    {
+        return LogOptions::defaults()
+            ->logFillable()
+            ->logOnlyDirty()
+            ->dontSubmitEmptyLogs();
+    }
+}