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/requests/task.go

@@ -88,5 +88,12 @@ type CreateTaskCompletionRequest struct {
 	CompletedAt *time.Time       `json:"completed_at"` // Defaults to now
 	Notes       string           `json:"notes"`
 	ActualCost  *decimal.Decimal `json:"actual_cost"`
-	PhotoURL    string           `json:"photo_url"`
+	Rating      *int             `json:"rating"` // 1-5 star rating
+	ImageURLs   []string         `json:"image_urls"` // Multiple image URLs
+}
+
+// CompletionImageInput represents an image to add to a completion
+type CompletionImageInput struct {
+	ImageURL string `json:"image_url" binding:"required"`
+	Caption  string `json:"caption"`
 }