Initialize HemHub project foundation

backend/src/main/java/se/rubble/hemhub/HealthController.java

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+package se.rubble.hemhub;
+
+import java.util.Map;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api")
+public class HealthController {
+
+    @GetMapping("/health")
+    public Map<String, String> health() {
+        return Map.of("status", "UP");
+    }
+}
+

backend/src/main/java/se/rubble/hemhub/HemHubApplication.java

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+package se.rubble.hemhub;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class HemHubApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(HemHubApplication.class, args);
+    }
+}
+

backend/src/test/java/se/rubble/hemhub/HealthControllerTest.java

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+package se.rubble.hemhub;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+class HealthControllerTest {
+
+    private final MockMvc mockMvc =
+            MockMvcBuilders.standaloneSetup(new HealthController()).build();
+
+    @Test
+    void healthReturnsUp() throws Exception {
+        mockMvc.perform(get("/api/health"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.status").value("UP"));
+    }
+}
+