Refactor namespaces to remove "Companion" and standardize to "PetCompanion"

Data/ApplicationDbContext.cs

@@ -1,7 +1,7 @@
 using Microsoft.EntityFrameworkCore;
-using Pet.Companion.Models;
+using PetCompanion.Models;
 
-namespace Pet.Companion.Data
+namespace PetCompanion.Data
 {
     public class ApplicationDbContext : DbContext
     {