feat: 小程序脚本首页重构 + 社交数据导入 + TTS 播放优化

- 后端：新增社交数据导入/审批/洞察生成 API（SocialContent/SocialInsight）
- 后端：优化脚本上下文服务，TTS 服务增强
- 小程序：重构脚本首页布局，新增社交导入页面
- 小程序：新增 useTtsPlayer composable，移除旧 ScriptAudioPlayer 组件
- 小程序：新增社交导入服务，优化请求服务
- SQL：新增社交数据导入建表脚本
- 文档：补充设计文档和实施计划

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend-single/src/main/java/com/emotion/entity/SocialContentItem.java

@@ -0,0 +1,66 @@
+package com.emotion.entity;
+
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableName;
+import com.baomidou.mybatisplus.extension.handlers.JacksonTypeHandler;
+import com.emotion.common.BaseEntity;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NoArgsConstructor;
+import lombok.experimental.SuperBuilder;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Social content voluntarily imported by a user.
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+@SuperBuilder
+@NoArgsConstructor
+@AllArgsConstructor
+@TableName(value = "t_social_content_item", autoResultMap = true)
+public class SocialContentItem extends BaseEntity {
+
+    @TableField("user_id")
+    private String userId;
+
+    @TableField("platform")
+    private String platform;
+
+    @TableField("source_type")
+    private String sourceType;
+
+    @TableField("source_url")
+    private String sourceUrl;
+
+    @TableField("title")
+    private String title;
+
+    @TableField("content")
+    private String content;
+
+    @TableField(value = "image_urls", typeHandler = JacksonTypeHandler.class)
+    private List<String> imageUrls;
+
+    @TableField("published_at")
+    private LocalDateTime publishedAt;
+
+    @TableField("import_status")
+    private String importStatus;
+
+    @TableField("approved_for_ai")
+    private Integer approvedForAi;
+
+    @TableField("content_hash")
+    private String contentHash;
+
+    @TableField(value = "raw_metadata", typeHandler = JacksonTypeHandler.class)
+    private Map<String, Object> rawMetadata;
+
+    @TableField("deleted_at")
+    private LocalDateTime deletedAt;
+}