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/Tables/WeeklyForecastsTable.php

@@ -0,0 +1,87 @@
+<?php
+
+namespace App\Filament\Resources\WeeklyForecasts\Tables;
+
+use App\Models\WeeklyForecast;
+use Filament\Actions\ViewAction;
+use Filament\Tables\Columns\IconColumn;
+use Filament\Tables\Columns\TextColumn;
+use Filament\Tables\Filters\Filter;
+use Filament\Tables\Filters\SelectFilter;
+use Filament\Tables\Table;
+use Illuminate\Database\Eloquent\Builder;
+
+class WeeklyForecastsTable
+{
+    public static function configure(Table $table): Table
+    {
+        return $table
+            ->columns([
+                TextColumn::make('forecast_for')
+                    ->label('Forecast for')
+                    ->date('d M Y')
+                    ->sortable(),
+                TextColumn::make('direction')
+                    ->badge()
+                    ->color(fn (string $state) => match ($state) {
+                        'rising' => 'warning',
+                        'falling' => 'success',
+                        default => 'gray',
+                    }),
+                TextColumn::make('magnitude_pence')
+                    ->label('Magnitude')
+                    ->state(fn (WeeklyForecast $record): string => self::formatMagnitude($record->magnitude_pence))
+                    ->sortable(),
+                TextColumn::make('ridge_confidence')
+                    ->label('Confidence')
+                    ->state(fn (WeeklyForecast $record): string => $record->ridge_confidence.'%')
+                    ->color(fn (WeeklyForecast $record) => $record->ridge_confidence < 40 ? 'warning' : null)
+                    ->sortable(),
+                IconColumn::make('flagged_duty_change')
+                    ->label('Duty change')
+                    ->boolean()
+                    ->trueColor('warning'),
+                TextColumn::make('model_version')
+                    ->searchable()
+                    ->limit(32)
+                    ->toggleable(isToggledHiddenByDefault: true),
+                TextColumn::make('generated_at')
+                    ->dateTime('d M Y H:i')
+                    ->sortable()
+                    ->toggleable(isToggledHiddenByDefault: true),
+            ])
+            ->defaultSort('forecast_for', 'desc')
+            ->filters([
+                SelectFilter::make('direction')
+                    ->multiple()
+                    ->options([
+                        'rising' => 'Rising',
+                        'falling' => 'Falling',
+                        'flat' => 'Flat',
+                    ]),
+                Filter::make('high_confidence')
+                    ->label('High confidence')
+                    ->toggle()
+                    ->query(fn (Builder $query) => $query->where('ridge_confidence', '>=', 70)),
+                Filter::make('flagged_duty_change')
+                    ->label('Duty-change-adjacent')
+                    ->toggle()
+                    ->query(fn (Builder $query) => $query->where('flagged_duty_change', true)),
+            ])
+            ->recordActions([
+                ViewAction::make(),
+            ]);
+    }
+
+    protected static function formatMagnitude(?int $magnitudePence): string
+    {
+        if ($magnitudePence === null) {
+            return '—';
+        }
+
+        $pence = round($magnitudePence / 100, 1);
+        $sign = $pence > 0 ? '+' : '';
+
+        return $sign.$pence.'p';
+    }
+}