Fixed Auth and Connection issues

src/test/resources/application-integration.properties

@@ -0,0 +1,10 @@
+# H2 in-memory database replaces PostgreSQL for integration tests
+spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;MODE=PostgreSQL
+spring.datasource.driver-class-name=org.h2.Driver
+spring.datasource.username=sa
+spring.datasource.password=
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
+spring.jpa.hibernate.ddl-auto=create-drop
+
+# Placeholder URI — TestJwtDecoderConfig overrides the decoder bean so this URI is never fetched
+spring.security.oauth2.resourceserver.jwt.jwk-set-uri=https://placeholder.invalid/jwks