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>

app/Http/Controllers/ClientController.php

@@ -141,7 +141,7 @@ class ClientController extends Controller
 
         $client->load(['internalResponsible', 'contacts']);
 
-        $folders = $client->folders()
+        $declarations = $client->declarations()
             ->with(['assignee'])
             ->latest()
             ->limit(50)
@@ -153,18 +153,18 @@ class ClientController extends Controller
                 'status' => $f->status->value,
                 'due_date' => $f->due_date?->format('Y-m-d'),
                 'created_at' => $f->created_at->format('Y-m-d'),
-                'showUrl' => route('folders.show', $f),
+                'showUrl' => route('declarations.show', $f),
             ])
             ->values()
             ->all();
 
-        $allFolders = $client->folders()->get();
+        $allDeclarations = $client->declarations()->get();
         $stats = [
-            'total' => $allFolders->count(),
-            'by_status' => $allFolders->groupBy(fn ($f) => $f->status->value)
+            'total' => $allDeclarations->count(),
+            'by_status' => $allDeclarations->groupBy(fn ($f) => $f->status->value)
                 ->map->count()
                 ->all(),
-            'by_type' => $allFolders->groupBy(fn ($f) => $f->type->value)
+            'by_type' => $allDeclarations->groupBy(fn ($f) => $f->type->value)
                 ->map->count()
                 ->all(),
         ];
@@ -185,11 +185,11 @@ class ClientController extends Controller
                 'status' => $client->status?->value,
                 'internal_notes' => $client->internal_notes,
             ],
-            'folders' => $folders,
+            'declarations' => $declarations,
             'stats' => $stats,
             'indexUrl' => route('clients.index'),
             'editUrl' => route('clients.edit', $client),
-            'createFolderUrl' => route('folders.create', ['client_id' => $client->id]),
+            'createDeclarationUrl' => route('declarations.create', ['client_id' => $client->id]),
         ]);
     }