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/WeeklyForecastResourceTest.php

@@ -0,0 +1,43 @@
+<?php
+
+use App\Filament\Resources\WeeklyForecasts\Pages\ListWeeklyForecasts;
+use App\Filament\Resources\WeeklyForecasts\Pages\ViewWeeklyForecast;
+use App\Filament\Resources\WeeklyForecasts\WeeklyForecastResource;
+use App\Models\User;
+use App\Models\WeeklyForecast;
+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 weekly forecasts sorted by forecast_for desc', function () {
+    $older = WeeklyForecast::factory()->create(['forecast_for' => '2026-04-06']);
+    $newer = WeeklyForecast::factory()->create(['forecast_for' => '2026-05-04']);
+
+    Livewire::test(ListWeeklyForecasts::class)
+        ->assertOk()
+        ->assertCanSeeTableRecords([$newer, $older], inOrder: true);
+});
+
+it('disables create and edit', function () {
+    $forecast = WeeklyForecast::factory()->create();
+
+    expect(WeeklyForecastResource::canCreate())->toBeFalse();
+    expect(WeeklyForecastResource::canEdit($forecast))->toBeFalse();
+    expect(WeeklyForecastResource::canDelete($forecast))->toBeFalse();
+});
+
+it('renders the view page for a forecast', function () {
+    $forecast = WeeklyForecast::factory()->create([
+        'reasoning' => 'Brent stabilising; supermarket cycle entering bottom.',
+    ]);
+
+    Livewire::test(ViewWeeklyForecast::class, ['record' => $forecast->id])
+        ->assertOk()
+        ->assertSee('Brent stabilising; supermarket cycle entering bottom.');
+});