Initialize Spring Boot project

backend/src/main/resources/application.yml

@@ -0,0 +1,43 @@
+spring:
+  application:
+    name: petshop-backend
+
+  datasource:
+    url: ${DB_URL:jdbc:mysql://localhost:3306/petshop?createDatabaseIfNotExist=true}
+    username: ${DB_USERNAME:root}
+    password: ${DB_PASSWORD:password}
+    driver-class-name: com.mysql.cj.jdbc.Driver
+
+  jpa:
+    hibernate:
+      ddl-auto: validate
+    show-sql: ${JPA_SHOW_SQL:false}
+    properties:
+      hibernate:
+        format_sql: true
+        dialect: org.hibernate.dialect.MySQLDialect
+
+  flyway:
+    enabled: true
+    baseline-on-migrate: true
+    locations: classpath:db/migration
+
+server:
+  port: ${SERVER_PORT:8080}
+  servlet:
+    context-path: /
+
+springdoc:
+  api-docs:
+    path: /v3/api-docs
+  swagger-ui:
+    path: /swagger-ui
+
+jwt:
+  secret: ${JWT_SECRET:your-256-bit-secret-key-change-this-in-production-min-32-chars}
+  expiration: ${JWT_EXPIRATION:86400000}
+
+logging:
+  level:
+    com.petshop: ${LOG_LEVEL:INFO}
+    org.springframework.security: ${LOG_LEVEL_SECURITY:WARN}