feat: Add Global Module Settings and Caption to Images

- Introduced GlobalModuleSettings model for platform-wide module enable/disable settings.
- Added 'caption' field to Images model to store image captions.
- Updated GenerateImagePromptsFunction to handle new caption structure in prompts.
- Enhanced AIPromptViewSet to return global prompt types and validate active prompts.
- Modified serializers and views to accommodate new caption field and global settings.
- Updated frontend components to display captions and filter prompts based on active types.
- Created migrations for GlobalModuleSettings and added caption field to Images.

frontend/src/services/api.ts

@@ -1377,6 +1377,7 @@ export interface ImageRecord {
   image_url?: string | null;
   image_path?: string | null;
   prompt?: string | null;
+  caption?: string | null;
   status: string;
   position: number;
   created_at: string;