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/WatchedEvents/Tables/WatchedEventsTable.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace App\Filament\Resources\WatchedEvents\Tables;
+
+use App\Models\WatchedEvent;
+use Filament\Actions\BulkActionGroup;
+use Filament\Actions\DeleteAction;
+use Filament\Actions\DeleteBulkAction;
+use Filament\Actions\EditAction;
+use Filament\Tables\Columns\TextColumn;
+use Filament\Tables\Filters\Filter;
+use Filament\Tables\Table;
+use Illuminate\Database\Eloquent\Builder;
+
+class WatchedEventsTable
+{
+    public static function configure(Table $table): Table
+    {
+        return $table
+            ->columns([
+                TextColumn::make('label')
+                    ->searchable()
+                    ->sortable()
+                    ->limit(60)
+                    ->tooltip(fn (WatchedEvent $record) => strlen($record->label) > 60 ? $record->label : null),
+                TextColumn::make('starts_at')
+                    ->dateTime('d M Y H:i')
+                    ->sortable(),
+                TextColumn::make('ends_at')
+                    ->dateTime('d M Y H:i')
+                    ->sortable(),
+                TextColumn::make('status')
+                    ->label('Status')
+                    ->badge()
+                    ->state(fn (WatchedEvent $record): string => self::isActive($record) ? 'Active' : 'Inactive')
+                    ->color(fn (string $state) => $state === 'Active' ? 'success' : 'gray'),
+                TextColumn::make('notes')
+                    ->limit(50)
+                    ->placeholder('—')
+                    ->toggleable(isToggledHiddenByDefault: true),
+            ])
+            ->defaultSort('starts_at', 'desc')
+            ->filters([
+                Filter::make('currently_active')
+                    ->label('Currently active')
+                    ->toggle()
+                    ->query(fn (Builder $query) => $query
+                        ->where('starts_at', '<=', now())
+                        ->where('ends_at', '>=', now())),
+            ])
+            ->recordActions([
+                EditAction::make(),
+                DeleteAction::make(),
+            ])
+            ->toolbarActions([
+                BulkActionGroup::make([
+                    DeleteBulkAction::make(),
+                ]),
+            ]);
+    }
+
+    protected static function isActive(WatchedEvent $record): bool
+    {
+        $now = now();
+
+        return $record->starts_at !== null
+            && $record->ends_at !== null
+            && $record->starts_at->lessThanOrEqualTo($now)
+            && $record->ends_at->greaterThanOrEqualTo($now);
+    }
+}