feat: simplified request pipeline, improved query handling, unified filter logic, and added IQuery support

Author: ReneSchwarzer

src/WebExpress.WebIndex.Test/Queries/UnitTestExpressionExtensions.cs

@@ -30,11 +30,10 @@ public void DefaultQuery()
         }
 
         /// <summary>
-        /// Verifies that the class is immutable by ensuring that applying a filter 
-        /// returns a new instance without modifying the original.
+        /// Verifies that the class implements mutable behavior when applying filters.
         /// </summary>
         [Fact]
-        public void Immutable()
+        public void Mutable()
         {
             // arrange
             var q1 = new Query<IndexItem>();
@@ -43,9 +42,10 @@ public void Immutable()
             var q2 = q1.Where(x => x.Value > 10);
 
             // validation
-            Assert.NotSame(q1, q2);
-            Assert.Empty(q1.Filters);
+            Assert.Same(q1, q2);
+            Assert.Single(q1.Filters);
             Assert.Single(q2.Filters);
+            Assert.Equal(q1.Filters, q2.Filters);
         }
 
         /// <summary>

src/WebExpress.WebIndex.Test/Queries/UnitTestQuery.cs

@@ -0,0 +1,19 @@
+using System;
+
+namespace WebExpress.WebIndex.Queries
+{
+    /// <summary>
+    /// Provides a default implementation of a query context that manages 
+    /// resources for query operations.
+    /// </summary>
+    public class DefaultQueryContext : IQueryContext
+    {
+        /// <summary>
+        /// Releases all resources used by the current instance of the class.
+        /// </summary>
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+        }
+    }
+}