Add all files

app/Admin/Resources/EmailTemplateResource.php

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+<?php
+
+namespace App\Admin\Resources;
+
+use App\Admin\Resources\EmailTemplateResource\Pages;
+use App\Models\EmailTemplate;
+use Filament\Forms;
+use Filament\Forms\Form;
+use Filament\Resources\Resource;
+use Filament\Tables;
+use Filament\Tables\Table;
+
+class EmailTemplateResource extends Resource
+{
+    protected static ?string $model = EmailTemplate::class;
+
+    protected static ?string $navigationIcon = 'ri-mail-settings-line';
+
+    protected static ?string $activeNavigationIcon = 'ri-mail-settings-fill';
+
+    protected static ?string $navigationGroup = 'Other';
+
+    public static function form(Form $form): Form
+    {
+        return $form
+            ->schema([
+                Forms\Components\TextInput::make('key')
+                    ->required()
+                    ->disabledOn('edit')
+                    ->maxLength(255),
+                Forms\Components\TextInput::make('subject')
+                    ->required()
+                    ->maxLength(255),
+                Forms\Components\Toggle::make('enabled')
+                    ->required(),
+                Forms\Components\MarkdownEditor::make('body')
+                    ->hint('Use either Markdown or HTML to compose the email body.')
+                    ->disableAllToolbarButtons()
+                    ->required()
+                    ->columnSpanFull(),
+                Forms\Components\TagsInput::make('cc')
+                    ->placeholder('mail@example.com')
+                    ->nestedRecursiveRules(['required', 'email'])
+                    ->columnSpanFull(),
+                Forms\Components\TagsInput::make('bcc')
+                    ->nestedRecursiveRules(['required', 'email'])
+                    ->placeholder('mail@example.com')
+                    ->columnSpanFull(),
+            ]);
+    }
+
+    public static function table(Table $table): Table
+    {
+        return $table
+            ->columns([
+                Tables\Columns\TextColumn::make('subject')
+                    ->searchable(),
+                Tables\Columns\IconColumn::make('enabled')
+                    ->boolean(),
+            ])
+            ->filters([
+                //
+            ])
+            ->actions([
+                Tables\Actions\EditAction::make(),
+            ]);
+    }
+
+    public static function getRelations(): array
+    {
+        return [
+            //
+        ];
+    }
+
+    public static function getPages(): array
+    {
+        return [
+            'index' => Pages\ListEmailTemplates::route('/'),
+            'create' => Pages\CreateEmailTemplate::route('/create'),
+            'edit' => Pages\EditEmailTemplate::route('/{record}/edit'),
+        ];
+    }
+}