placeholder backend unit and integration testing files

backend/src/test/java/com/mealchemy/MealchemyApplicationIntegrationTest.java

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+package com.mealchemy;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class MealchemyApplicationIntegrationTest {
+
+    @Test
+    void applicationContextLoads() {
+        // Verifies the full Spring context starts without errors against a real database.
+        // Requires SPRING_DATASOURCE_* env vars, set automatically by CI (ci.yml postgres service).
+    }
+}

backend/src/test/java/com/mealchemy/MealchemyApplicationUnitTest.java

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+package com.mealchemy;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class MealchemyApplicationUnitTest {
+
+    @Test
+    void placeholderPassesUntilRealTestsAreAdded() {
+        assertTrue(true);
+    }
+}
+
+//placeholder asserts true so ci doesn't fail with no testing. remove this once testing starts