chore: Move solutions to solutions folder

AdventOfCode2025/Program.cs

@@ -1,4 +1,6 @@
-namespace AdventOfCode2025;
+using AdventOfCode2025.Solutions;
+
+namespace AdventOfCode2025;
 
 internal class Program
 {
@@ -19,7 +21,7 @@ internal class Program
     {
         var solutionText = $"Solution for Day {day.ToString().PadLeft(2, '0')}:";
         var className = $"Day{day}";
-        var classType = Type.GetType($"AdventOfCode2025.{className}");
+        var classType = Type.GetType($"AdventOfCode2025.Solutions.{className}");
         if (classType == null)
         {
             Console.WriteLine($"{solutionText} is not implemented.");

AdventOfCode2025/Solutions/Day1.cs

@@ -1,6 +1,6 @@
 using AdventOfCode2025.Inputs;
 
-namespace AdventOfCode2025;
+namespace AdventOfCode2025.Solutions;
 
 public sealed class Day1 : Solution
 {

AdventOfCode2025/Solutions/Day2.cs

@@ -1,6 +1,6 @@
 using AdventOfCode2025.Inputs;
 
-namespace AdventOfCode2025;
+namespace AdventOfCode2025.Solutions;
 
 public class Day2 : Solution
 {

AdventOfCode2025/Solutions/Day3.cs

@@ -1,6 +1,6 @@
 using AdventOfCode2025.Inputs;
 
-namespace AdventOfCode2025;
+namespace AdventOfCode2025.Solutions;
 
 public class Day3 : Solution
 {

AdventOfCode2025/Solutions/Day4.cs

@@ -1,6 +1,6 @@
 using AdventOfCode2025.Inputs;
 
-namespace AdventOfCode2025;
+namespace AdventOfCode2025.Solutions;
 
 public class Day4 : Solution
 {

AdventOfCode2025/Solutions/Day5.cs

@@ -1,6 +1,6 @@
 using AdventOfCode2025.Inputs;
 
-namespace AdventOfCode2025;
+namespace AdventOfCode2025.Solutions;
 
 public class Day5 : Solution
 {

AdventOfCode2025/Solutions/Solution.cs

@@ -1,4 +1,4 @@
-namespace AdventOfCode2025;
+namespace AdventOfCode2025.Solutions;
 
 public abstract class Solution
 {