feat(AI): add ai manager admin and create powerpoint with ai

app/Models/AiProvider.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\AiProviderDriver;
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Attributes\Hidden;
+use Illuminate\Database\Eloquent\Model;
+
+#[Fillable(['name', 'driver', 'model', 'base_url', 'api_key', 'is_active', 'is_default'])]
+#[Hidden(['api_key'])]
+class AiProvider extends Model
+{
+    public function resolvedBaseUrl(): string
+    {
+        return $this->base_url ?: $this->driver->defaultBaseUrl();
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'driver' => AiProviderDriver::class,
+            'api_key' => 'encrypted',
+            'is_active' => 'boolean',
+            'is_default' => 'boolean',
+        ];
+    }
+}

app/Models/TemplateKey.php

@@ -4,6 +4,7 @@ namespace App\Models;
 
 use App\Enums\TemplateKeyType;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
@@ -27,6 +28,17 @@ class TemplateKey extends Model
         return $this->belongsTo(Template::class);
     }
 
+    /**
+     * Strip any literal curly braces the admin may have copied from the pptx placeholder
+     * (e.g. "{Main Title}" -> "Main Title"), since braces are added automatically at match time.
+     */
+    protected function key(): Attribute
+    {
+        return Attribute::make(
+            set: fn (string $value) => trim($value, "{} \t\n\r\0\x0B"),
+        );
+    }
+
     /**
      * @return array<string, string>
      */