fix(ai): restore WebClient runtime auto-configuration

Use Spring Boot 4's dedicated WebClient starter and cover the AI client bean wiring with a regression test.

Author: JasonTM17

ai-service/pom.xml

@@ -25,7 +25,7 @@
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-webflux</artifactId>
+            <artifactId>spring-boot-starter-webclient</artifactId>
             <exclusions>
                 <exclusion>
                     <groupId>io.netty</groupId>

ai-service/src/test/java/com/devhire/ai/config/AiWebClientConfigurationTest.java

@@ -0,0 +1,35 @@
+package com.devhire.ai.config;
+
+import com.devhire.ai.client.AnthropicClaudeClient;
+import com.devhire.ai.tool.JobSearchTool;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.boot.webclient.autoconfigure.WebClientAutoConfiguration;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+import org.springframework.web.reactive.function.client.WebClient;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class AiWebClientConfigurationTest {
+
+    private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+            .withConfiguration(AutoConfigurations.of(WebClientAutoConfiguration.class))
+            .withBean(AiProperties.class, AiProperties::new)
+            .withUserConfiguration(ClientConfiguration.class);
+
+    @Test
+    void autoConfiguresWebClientBuilderForAiClients() {
+        contextRunner.run(context -> {
+            assertThat(context).hasSingleBean(WebClient.Builder.class);
+            assertThat(context).hasSingleBean(AnthropicClaudeClient.class);
+            assertThat(context).hasSingleBean(JobSearchTool.class);
+        });
+    }
+
+    @Configuration(proxyBeanMethods = false)
+    @Import({AnthropicClaudeClient.class, JobSearchTool.class})
+    static class ClientConfiguration {
+    }
+}