fix: aligne les variables d'env application.yml avec le compose de production

DATASOURCE_URL/USERNAME/PASSWORD correspondent aux variables définies dans
le docker-compose.yml de l'Infra. Ajout de cors.allowed-origin pour le futur.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main/resources/application.yml

@@ -1,8 +1,8 @@
 spring:
   datasource:
-    url: jdbc:postgresql://${DB_HOST:localhost}:${DB_PORT:5432}/${DB_NAME:olhar}
-    username: ${DB_USER:olhar}
-    password: ${DB_PASSWORD:olhar}
+    url: ${DATASOURCE_URL:jdbc:postgresql://localhost:5432/olhar}
+    username: ${DATASOURCE_USERNAME:olhar}
+    password: ${DATASOURCE_PASSWORD:olhar}
     driver-class-name: org.postgresql.Driver
   jpa:
     hibernate:
@@ -30,3 +30,6 @@ security:
   jwt:
     secret: ${JWT_SECRET:changeme-in-production-use-a-long-random-string-at-least-256-bits}
     expiration-ms: ${JWT_EXPIRATION_MS:86400000}
+
+cors:
+  allowed-origin: ${CORS_ALLOWED_ORIGIN_PROD:http://localhost:4200}