refactor(phase1): 完成包名重构 (org.example → com.superbiz.agent)

Task 4.1: 包名统一重构
- 重命名 41 个 Java 文件的包名
- 更新所有 import 语句
- 恢复枚举类（FaultCategory、DiagnosisStatus、SourceType）
- 更新测试类的 import

重构范围：
- domain/entity: 3 个实体类
- domain/model: 2 个数据类
- domain/enums: 3 个枚举类
- repository: 3 个接口
- service/session: 2 个类（接口 + 实现）
- config: 9 个配置类
- controller: 2 个控制器
- agent/tool: 4 个工具类
- client: 1 个客户端
- Main.java: 主类

验证结果：
- 编译成功，无错误
- 所有测试通过 (27/27)
  - ApiDocumentRepositoryTest: 7/7 ✅
  - CaseLibraryRepositoryTest: 6/6 ✅
  - DiagnosisRecordRepositoryTest: 6/6 ✅
  - RedisSessionManagerTest: 8/8 ✅

Progress: 21/33 tasks completed (64%)

src/main/java/com/superbiz/agent/config/SiliconFlowEmbeddingConfig.java

@@ -0,0 +1,54 @@
+package com.superbiz.agent.config;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.ai.document.MetadataMode;
+import org.springframework.ai.embedding.EmbeddingModel;
+import org.springframework.ai.openai.OpenAiEmbeddingModel;
+import org.springframework.ai.openai.OpenAiEmbeddingOptions;
+import org.springframework.ai.openai.api.OpenAiApi;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.client.RestClient;
+import org.springframework.web.reactive.function.client.WebClient;
+
+/**
+ * SiliconFlow Embedding 配置（BGE-M3, OpenAI 兼容协议, 1024维）
+ * <p>
+ * Chat 走 DeepSeek、Embedding 走 SiliconFlow，两者都是 OpenAI 兼容但地址不同，
+ * 因此单独为 SiliconFlow 创建 OpenAiApi + EmbeddingModel Bean。
+ */
+@Configuration
+public class SiliconFlowEmbeddingConfig {
+
+    private static final Logger log = LoggerFactory.getLogger(SiliconFlowEmbeddingConfig.class);
+
+    @Value("${siliconflow.api-key}")
+    private String apiKey;
+
+    @Value("${siliconflow.base-url}")
+    private String baseUrl;
+
+    @Value("${siliconflow.embedding.model}")
+    private String model;
+
+    @Bean
+    public OpenAiApi siliconFlowApi(RestClient.Builder restClientBuilder, WebClient.Builder webClientBuilder) {
+        log.info("创建 SiliconFlow OpenAiApi: {}", baseUrl);
+        return OpenAiApi.builder()
+                .baseUrl(baseUrl)
+                .apiKey(apiKey)
+                .restClientBuilder(restClientBuilder)
+                .build();
+    }
+
+    @Bean
+    public EmbeddingModel siliconFlowEmbeddingModel(OpenAiApi siliconFlowApi) {
+        log.info("创建 SiliconFlow EmbeddingModel, model: {}", model);
+        return new OpenAiEmbeddingModel(siliconFlowApi, MetadataMode.EMBED,
+                OpenAiEmbeddingOptions.builder()
+                        .model(model)
+                        .build());
+    }
+}