feat: complete Epic 0 — foundation migration & infrastructure setup

Stories 0.2-0.5: rename folders→declarations (backend+frontend), configure
Redis for cache/queue/sessions, add foundation database migrations
(permissions, archived_at), replace DeclarationStatus enum with architecture
lifecycle values, create DeclarationObserver for status transition validation
and auto-archive, fix controller status transitions to respect observer rules.

93 tests pass (240 assertions).

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

database/migrations/2026_02_28_102716_create_activity_log_table.php

@@ -1,8 +1,8 @@
 <?php
 
-use Illuminate\Support\Facades\Schema;
-use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
 
 class CreateActivityLogTable extends Migration
 {

database/migrations/2026_02_28_102717_add_event_column_to_activity_log_table.php

@@ -1,8 +1,8 @@
 <?php
 
-use Illuminate\Support\Facades\Schema;
-use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
 
 class AddEventColumnToActivityLogTable extends Migration
 {

database/migrations/2026_02_28_102718_add_batch_uuid_column_to_activity_log_table.php

@@ -1,8 +1,8 @@
 <?php
 
-use Illuminate\Support\Facades\Schema;
-use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
 
 class AddBatchUuidColumnToActivityLogTable extends Migration
 {

database/migrations/2026_03_11_000002_update_polymorphic_folder_to_declaration.php

@@ -0,0 +1,29 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        DB::table('media')
+            ->where('model_type', 'App\\Models\\Folder')
+            ->update(['model_type' => 'App\\Models\\Declaration']);
+
+        DB::table('activity_log')
+            ->where('subject_type', 'App\\Models\\Folder')
+            ->update(['subject_type' => 'App\\Models\\Declaration']);
+    }
+
+    public function down(): void
+    {
+        DB::table('media')
+            ->where('model_type', 'App\\Models\\Declaration')
+            ->update(['model_type' => 'App\\Models\\Folder']);
+
+        DB::table('activity_log')
+            ->where('subject_type', 'App\\Models\\Declaration')
+            ->update(['subject_type' => 'App\\Models\\Folder']);
+    }
+};

database/migrations/2026_03_12_044146_add_permissions_to_workspace_user.php

@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('workspace_user', function (Blueprint $table) {
+            $table->json('permissions')->nullable()->default(null)->after('role');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('workspace_user', function (Blueprint $table) {
+            $table->dropColumn('permissions');
+        });
+    }
+};

database/migrations/2026_03_12_044334_add_archived_at_to_declarations.php

@@ -0,0 +1,30 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('declarations', function (Blueprint $table) {
+            $table->timestamp('archived_at')->nullable()->after('deleted_at');
+            $table->index('archived_at');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('declarations', function (Blueprint $table) {
+            $table->dropIndex(['archived_at']);
+            $table->dropColumn('archived_at');
+        });
+    }
+};

database/migrations/2026_03_12_044414_migrate_declaration_status_values.php

@@ -0,0 +1,39 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        $mapping = [
+            'draft' => 'created',
+            'waiting_documents' => 'en_cours',
+            'documents_received' => 'en_cours',
+            'processing' => 'en_cours',
+            'additional_documents_requested' => 'en_attente_client',
+            'waiting_client_validation' => 'en_attente_client',
+            'validated' => 'termine',
+            'closed' => 'ferme',
+            'cancelled' => 'ferme',
+        ];
+
+        foreach ($mapping as $old => $new) {
+            DB::table('declarations')
+                ->where('status', $old)
+                ->update(['status' => $new]);
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        // Data migration cannot be reversed — old status distinctions are lost
+    }
+};