chore: repository 패키지 생성 및 JPA repository 작성

src/main/java/com/untitled/cherrymap/repository/AlertMessageRepository.java

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+package com.untitled.cherrymap.repository;
+
+import com.untitled.cherrymap.domain.AlertMessage;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface AlertMessageRepository extends JpaRepository<AlertMessage, Long> {
+    AlertMessage findByMode(String mode);
+}

src/main/java/com/untitled/cherrymap/repository/MemberRepository.java

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+package com.untitled.cherrymap.repository;
+
+import com.untitled.cherrymap.domain.Member;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface MemberRepository extends JpaRepository<Member, Long> {
+    Member findByProviderId(String providerId);
+}

src/main/java/com/untitled/cherrymap/repository/RouteRepository.java

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+package com.untitled.cherrymap.repository;
+
+import com.untitled.cherrymap.domain.Route;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface RouteRepository extends JpaRepository<Route, Long> {
+}