feat(admin): add Filament resources for the forecasting stack

Adds three resources under a new "Forecasting" navigation group: a full-CRUD
WatchedEventResource for the Layer 5 volatility detector, plus read-only
WeeklyForecastResource and BacktestResource so the ridge model output and
its calibration can be inspected without SQL.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/Feature/Admin/WatchedEventResourceTest.php

@@ -0,0 +1,58 @@
+<?php
+
+use App\Filament\Resources\WatchedEvents\Pages\CreateWatchedEvent;
+use App\Filament\Resources\WatchedEvents\Pages\ListWatchedEvents;
+use App\Models\User;
+use App\Models\WatchedEvent;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Livewire\Livewire;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function () {
+    $this->admin = User::factory()->admin()->create();
+    $this->actingAs($this->admin);
+});
+
+it('lists watched events', function () {
+    $events = WatchedEvent::factory()->count(3)->create();
+
+    Livewire::test(ListWatchedEvents::class)
+        ->assertOk()
+        ->assertCanSeeTableRecords($events);
+});
+
+it('creates a watched event from the form', function () {
+    Livewire::test(CreateWatchedEvent::class)
+        ->fillForm([
+            'label' => 'Iran tensions Apr–May 2026',
+            'starts_at' => '2026-04-01 00:00:00',
+            'ends_at' => '2026-05-31 23:59:00',
+            'notes' => 'Geopolitical event affecting Brent crude.',
+        ])
+        ->call('create')
+        ->assertHasNoFormErrors();
+
+    expect(WatchedEvent::where('label', 'Iran tensions Apr–May 2026')->exists())->toBeTrue();
+});
+
+it('validates ends_at is after starts_at', function () {
+    Livewire::test(CreateWatchedEvent::class)
+        ->fillForm([
+            'label' => 'Bad dates',
+            'starts_at' => '2026-05-01 00:00:00',
+            'ends_at' => '2026-04-01 00:00:00',
+        ])
+        ->call('create')
+        ->assertHasFormErrors(['ends_at']);
+});
+
+it('filters to currently active events', function () {
+    $active = WatchedEvent::factory()->active()->create(['label' => 'Active event']);
+    $inactive = WatchedEvent::factory()->inactive()->create(['label' => 'Inactive event']);
+
+    Livewire::test(ListWatchedEvents::class)
+        ->filterTable('currently_active')
+        ->assertCanSeeTableRecords([$active])
+        ->assertCanNotSeeTableRecords([$inactive]);
+});