Add multi-image support for task completions and documents

- Add TaskCompletionImage and DocumentImage models with one-to-many relationships
- Update admin panel to display images for completions and documents
- Add image arrays to API request/response DTOs
- Update repositories with Preload("Images") for eager loading
- Fix seed SQL execution to use raw SQL instead of prepared statements
- Fix table names in seed file (admin_users, push_notifications_*)
- Add comprehensive seed test data with 34 completion images and 24 document images
- Add subscription limitations admin feature with toggle
- Update admin sidebar with limitations link

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/dto/responses/document.go

@@ -16,6 +16,13 @@ type DocumentUserResponse struct {
 	LastName  string `json:"last_name"`
 }
 
+// DocumentImageResponse represents an image in a document
+type DocumentImageResponse struct {
+	ID       uint   `json:"id"`
+	ImageURL string `json:"image_url"`
+	Caption  string `json:"caption"`
+}
+
 // DocumentResponse represents a document in the API response
 type DocumentResponse struct {
 	ID            uint                  `json:"id"`
@@ -36,10 +43,11 @@ type DocumentResponse struct {
 	Vendor        string                `json:"vendor"`
 	SerialNumber  string                `json:"serial_number"`
 	ModelNumber   string                `json:"model_number"`
-	TaskID        *uint                 `json:"task_id"`
-	IsActive      bool                  `json:"is_active"`
-	CreatedAt     time.Time             `json:"created_at"`
-	UpdatedAt     time.Time             `json:"updated_at"`
+	TaskID        *uint                   `json:"task_id"`
+	IsActive      bool                    `json:"is_active"`
+	Images        []DocumentImageResponse `json:"images"`
+	CreatedAt     time.Time               `json:"created_at"`
+	UpdatedAt     time.Time               `json:"updated_at"`
 }
 
 // Note: Pagination removed - list endpoints now return arrays directly
@@ -81,6 +89,7 @@ func NewDocumentResponse(d *models.Document) DocumentResponse {
 		ModelNumber:   d.ModelNumber,
 		TaskID:        d.TaskID,
 		IsActive:      d.IsActive,
+		Images:        make([]DocumentImageResponse, 0),
 		CreatedAt:     d.CreatedAt,
 		UpdatedAt:     d.UpdatedAt,
 	}
@@ -89,6 +98,15 @@ func NewDocumentResponse(d *models.Document) DocumentResponse {
 		resp.CreatedBy = NewDocumentUserResponse(&d.CreatedBy)
 	}
 
+	// Convert images
+	for _, img := range d.Images {
+		resp.Images = append(resp.Images, DocumentImageResponse{
+			ID:       img.ID,
+			ImageURL: img.ImageURL,
+			Caption:  img.Caption,
+		})
+	}
+
 	return resp
 }