fix: Fixes and optimizes NameVerification and ProfanityProtection (#2153)

### Summary

Significantly improves the performance of NameVerification & ProfanityProtection:

```cs
| Method         | Mean      | Error     | StdDev    |
|--------------- |----------:|----------:|----------:|
| ValidateName   | 728.34 ns | 13.244 ns | 11.059 ns |
| ValidateNameSV |  26.62 ns |  0.233 ns |  0.207 ns |
```

Projects/UOContent.Tests/Tests/Misc/ProfanityProtectionTests.cs

@@ -0,0 +1,53 @@
+using Server.Misc;
+using Xunit;
+
+namespace Server.Tests;
+
+public class ProfanityProtectionTests
+{
+    [Theory]
+    [InlineData("Hello world")]
+    [InlineData("This is a normal conversation")]
+    [InlineData("I would like to trade with you")]
+    public void Speech_WithoutProfanity_PassesValidation(string speech)
+    {
+        Assert.False(ProfanityProtection.ContainsProfanity(speech));
+    }
+
+    [Fact]
+    public void Speech_Empty_PassesValidation()
+    {
+        Assert.False(ProfanityProtection.ContainsProfanity(""));
+    }
+
+    [Theory]
+    [InlineData("I'm going to class tomorrow")]  // contains "ass" but in "class"
+    [InlineData("This assignment is hard")]      // contains "ass" but in "assignment"
+    [InlineData("That's a nice cocktail")]       // contains "cock" but in "cocktail"
+    public void Speech_WithWordsThatLookLikeProfanity_PassesValidation(string speech)
+    {
+        Assert.False(ProfanityProtection.ContainsProfanity(speech));
+    }
+
+    [Theory]
+    [InlineData("This is ass")]
+    [InlineData("What the fuck")]
+    [InlineData("You're a bitch")]
+    public void Speech_WithProfanity_FailsValidation(string speech)
+    {
+        Assert.True(ProfanityProtection.ContainsProfanity(speech));
+    }
+
+    [Theory]
+    [InlineData("ass")]           // standalone profanity
+    [InlineData("an ass joke")]   // profanity with word boundaries
+    [InlineData("ass.")]          // profanity followed by punctuation
+    public void ContainsDisallowedWord_DetectsProfanityWithBoundaries(string speech)
+    {
+        Assert.True(NameVerification.ContainsDisallowedWord(
+            speech,
+            ProfanityProtection.Disallowed,
+            ProfanityProtection.DisallowedSearchValues
+        ));
+    }
+}