fix: 修复Windows终端UTF-8编码问题，恢复emoji字符

根因: System.out使用平台默认编码(CP936/GBK)，emoji无法编码显示为?。
修复方案:
1. JVM参数: -Dstdout.encoding=UTF-8 -Dstderr.encoding=UTF-8 -Dfile.encoding=UTF-8
2. 代码层: PrintStream使用StandardCharsets.UTF_8
3. 启动脚本: run.bat添加chcp 65001, run.ps1设置Console编码

同时revert之前的emoji→ASCII替换，恢复原始emoji符号。

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

pom.xml

@@ -97,7 +97,7 @@
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
                 <configuration>
-                    <jvmArguments>-Xmx512m -Xms256m --enable-native-access=ALL-UNNAMED</jvmArguments>
+                    <jvmArguments>-Xmx512m -Xms256m --enable-native-access=ALL-UNNAMED -Dstdout.encoding=UTF-8 -Dstderr.encoding=UTF-8 -Dfile.encoding=UTF-8</jvmArguments>
                 </configuration>
             </plugin>
             <plugin>

run.bat

@@ -15,6 +15,9 @@ REM === AI API 配置（按需修改） ===
 REM set ANTHROPIC_API_KEY=your-api-key-here
 REM set AI_MODEL=claude-sonnet-4-20250514
 
+REM === 设置控制台 UTF-8 编码（支持 emoji 等字符） ===
+chcp 65001 >nul 2>&1
+
 REM === 启动应用 ===
 cd /d %~dp0
 mvn spring-boot:run -q

run.ps1

@@ -14,6 +14,10 @@ $env:MAVEN_OPTS = "--enable-native-access=ALL-UNNAMED --sun-misc-unsafe-memory-a
 # $env:ANTHROPIC_API_KEY = "your-api-key-here"
 # $env:AI_MODEL = "claude-sonnet-4-20250514"
 
+# === 设置控制台 UTF-8 编码（支持 emoji 等字符） ===
+[Console]::OutputEncoding = [System.Text.Encoding]::UTF8
+[Console]::InputEncoding = [System.Text.Encoding]::UTF8
+
 # === 启动应用 ===
 Set-Location $PSScriptRoot
 mvn spring-boot:run -q

src/main/java/com/claudecode/repl/ReplSession.java

@@ -16,6 +16,7 @@ import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.PrintStream;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Scanner;
@@ -52,7 +53,8 @@ public class ReplSession {
         this.agentLoop = agentLoop;
         this.toolRegistry = toolRegistry;
         this.commandRegistry = commandRegistry;
-        this.out = System.out;
+        // 强制使用 UTF-8 编码输出，确保 emoji 等 Unicode 字符在 Windows 终端正常显示
+        this.out = new PrintStream(System.out, true, StandardCharsets.UTF_8);
         this.toolStatusRenderer = new ToolStatusRenderer(out);
         this.markdownRenderer = new MarkdownRenderer(out);
         this.spinner = new SpinnerAnimation(out);