fix(config): restore parametric datasource URLs after merge from dev

Dev branch had changed datasource URLs to env vars (SPRING_DATASOURCE_URL etc.)
for k8s deployments, but route-processing uses parametric config-server URLs
for local development.

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

config-repo/slots-service.yaml

@@ -108,9 +108,9 @@ spring:
       default-topic: pcp.tle
   datasource:
     driver-class-name: org.postgresql.Driver
-    url: "${SPRING_DATASOURCE_URL}"
-    username: "${SPRING_DATASOURCE_USERNAME}"
-    password: "${SPRING_DATASOURCE_PASSWORD}"
+    url: jdbc:postgresql://${pcp.infra.postgres.host}:${pcp.infra.postgres.port}/pcp_slots
+    username: postgres
+    password: password
   jpa:
     hibernate:
       ddl-auto: validate