feat: TTS 服务功能完善（任务管理、配置优化、客户端实现）

backend-single/src/test/java/com/emotion/service/TtsTaskServiceTest.java

@@ -12,11 +12,19 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
 class TtsTaskServiceTest {
 
     @Test
-    @DisplayName("cleanText strips markdown and normalizes whitespace")
-    void cleanTextStripsMarkdownAndNormalizesWhitespace() {
-        String cleaned = TtsTaskServiceImpl.cleanText("# Title\n\n> **hello**   `world` - ok");
+    @DisplayName("cleanText strips markdown but keeps Chinese narration rhythm")
+    void cleanTextStripsMarkdownButKeepsChineseNarrationRhythm() {
+        String cleaned = TtsTaskServiceImpl.cleanText("# 第一章\n\n> **她 终于**  看见了自己\n\n- 转身离开");
 
-        assertEquals("Title hello world ok", cleaned);
+        assertEquals("第一章。\n\n她终于看见了自己。\n\n转身离开。", cleaned);
+    }
+
+    @Test
+    @DisplayName("cleanText preserves sentence punctuation for natural pauses")
+    void cleanTextPreservesSentencePunctuationForNaturalPauses() {
+        String cleaned = TtsTaskServiceImpl.cleanText("他说：  这一次，我想自己选择！\n\n你听见了吗？");
+
+        assertEquals("他说：这一次，我想自己选择！\n\n你听见了吗？", cleaned);
     }
 
     @Test
@@ -28,6 +36,9 @@ class TtsTaskServiceTest {
     @Test
     @DisplayName("TtsEngineResult exposes synthesis result fields")
     void ttsEngineResultExposesFields() {
+        TtsEngineClient.SynthesisOptions options = new TtsEngineClient.SynthesisOptions(0.92D, 0D, "story");
+        assertEquals("rate=0.92;pitch=0.0;emotion=story", options.cacheKey());
+
         TtsEngineClient.TtsEngineResult result =
                 new TtsEngineClient.TtsEngineResult(true, "/tmp/a.mp3", 1200L, null);