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>

app/Filament/Resources/WeeklyForecasts/Schemas/WeeklyForecastInfolist.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace App\Filament\Resources\WeeklyForecasts\Schemas;
+
+use App\Models\WeeklyForecast;
+use Filament\Infolists\Components\IconEntry;
+use Filament\Infolists\Components\TextEntry;
+use Filament\Schemas\Components\Section;
+use Filament\Schemas\Schema;
+
+class WeeklyForecastInfolist
+{
+    public static function configure(Schema $schema): Schema
+    {
+        return $schema->components([
+            Section::make('Forecast')->columns(3)->schema([
+                TextEntry::make('forecast_for')->date('d M Y'),
+                TextEntry::make('direction')
+                    ->badge()
+                    ->color(fn (string $state) => match ($state) {
+                        'rising' => 'warning',
+                        'falling' => 'success',
+                        default => 'gray',
+                    }),
+                TextEntry::make('magnitude_pence')
+                    ->label('Magnitude')
+                    ->state(fn (WeeklyForecast $record): string => self::formatMagnitude($record->magnitude_pence)),
+                TextEntry::make('ridge_confidence')
+                    ->label('Confidence')
+                    ->state(fn (WeeklyForecast $record): string => $record->ridge_confidence.'%')
+                    ->color(fn (WeeklyForecast $record) => $record->ridge_confidence < 40 ? 'warning' : null),
+                IconEntry::make('flagged_duty_change')
+                    ->label('Duty change adjacent')
+                    ->boolean()
+                    ->trueColor('warning'),
+                TextEntry::make('generated_at')->dateTime('d M Y H:i'),
+            ]),
+            Section::make('Reasoning')->schema([
+                TextEntry::make('reasoning')
+                    ->columnSpanFull()
+                    ->placeholder('No reasoning recorded.'),
+            ]),
+            Section::make('Model')
+                ->description('Calibration table from the matching backtest determines the displayed confidence.')
+                ->schema([
+                    TextEntry::make('model_version')->columnSpanFull(),
+                ]),
+        ]);
+    }
+
+    protected static function formatMagnitude(?int $magnitudePence): string
+    {
+        if ($magnitudePence === null) {
+            return '—';
+        }
+
+        $pence = round($magnitudePence / 100, 1);
+        $sign = $pence > 0 ? '+' : '';
+
+        return $sign.$pence.'p';
+    }
+}