[#0165]feat(leetcode): Init project, add C# solution, unit test and README

problems/0165-compare-version-numbers/test/SolutionTests.cs

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+// LeetCode 165: Compare Version Numbers 單元測試（xUnit）
+
+using System.Linq;
+using Xunit;
+
+public class SolutionTests {
+    private readonly Solution _s = new Solution();
+
+    [Theory]
+    [InlineData("1.01", "1.001", 0)]
+    [InlineData("1.0", "1.0.0", 0)]
+    [InlineData("1.0.0.0", "1", 0)]
+    [InlineData("0.1", "1.1", -1)]
+    [InlineData("1.0.1", "1", 1)]
+    [InlineData("7.5.2.4", "7.5.3", -1)]
+    public void CompareVersion_ReturnsExpectedResult(string version1, string version2, int expected) {
+        var actual = _s.CompareVersion(version1, version2);
+
+        Assert.Equal(expected, actual);
+    }
+
+    [Theory]
+    [InlineData("1.0.1", "1")]
+    [InlineData("3.0.0", "2.9.9.9")]
+    [InlineData("10.4", "10.3.9")]
+    public void CompareVersion_IsAntiSymmetric(string left, string right) {
+        var forward = _s.CompareVersion(left, right);
+        var backward = _s.CompareVersion(right, left);
+
+        Assert.Equal(1, forward);
+        Assert.Equal(-1, backward);
+    }
+
+    [Theory]
+    [InlineData("", "", 0)]
+    [InlineData("", "0", 0)]
+    [InlineData("0.0.0", "", 0)]
+    [InlineData("000", "0", 0)]
+    [InlineData("2147483647", "2147483646", 1)]
+    [InlineData("2147483646", "2147483647", -1)]
+    public void CompareVersion_HandlesBoundaryInputs(string version1, string version2, int expected) {
+        var actual = _s.CompareVersion(version1, version2);
+
+        Assert.Equal(expected, actual);
+    }
+
+    [Fact]
+    public void CompareVersion_LongSequencesDifferAtEnd() {
+        var left = string.Join('.', Enumerable.Repeat("0", 199).Append("1"));
+        var right = string.Join('.', Enumerable.Repeat("0", 200));
+
+        var result = _s.CompareVersion(left, right);
+
+        Assert.Equal(1, result);
+    }
+}

problems/0165-compare-version-numbers/test/TestProject.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="../csharp/csharp.csproj" />
+  </ItemGroup>
+</Project>
+

problems/0165-compare-version-numbers/test/edge_cases.md

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+# 邊界情況清單（165 Compare Version Numbers）
+
+## 需要測試的邊界
+- [x] 空輸入 / 單一元素：`""`、`"0"`
+- [x] 重複元素 / 全相同：`"1.0.0"` vs `"1"`
+- [x] 極值（最小/最大）：`"2147483647"` vs `"2147483646"`
+- [x] 含負數 / 0 / 大數：題目無負數，已覆蓋多零與大修訂號
+- [x] 大資料量（接近上限）：200 段版本字串
+
+## 額外案例
+### 案例 1
+- 輸入：`version1 = "", version2 = "0"`
+- 預期：`0`
+- 說明：空字串缺少所有段，視為全 0
+
+### 案例 2
+- 輸入：`version1 = "2147483647", version2 = "2147483646"`
+- 預期：`1`
+- 說明：驗證最大 32-bit 整數段處理
+
+### 案例 3
+- 輸入：`version1 = "0.0.0", version2 = "0"`
+- 預期：`0`
+- 說明：多段全 0 與單段 0 視為相同
+
+### 案例 4
+- 輸入：`version1 = string.Join(".", Enumerable.Repeat("0", 199)) + ".1"`, `version2 = string.Join(".", Enumerable.Repeat("0", 200))`
+- 預期：`1`
+- 說明：長度 200 的版本字串，在最後一段差異才分勝負