feat(system): implement Phase 3 federated identity and multi-service architecture (#8)

* feat(infra): add and configure keycloak with postgres

* feat(support): update spring libraries

* feat(resource-server): complete migration to oauth2 resource server

* refactor(infra): harden network config and update prometheus

* feat(web-client): add new OIDC web client and integrate into stack

* docs(readme): create detailed README guide for Phase 3

Author: apenlor

.env.example

@@ -14,4 +14,16 @@ JWT_SECRET_KEY=replace-with-your-super-secret-and-long-key-for-hs256
 # Actuator basic auth configuration
 ACTUATOR_USERNAME=actuator
 ACTUATOR_PASSWORD=actuator-password
-ACTUATOR_ROLES=ACTUATOR_ADMIN
+ACTUATOR_ROLES=ACTUATOR_ADMIN
+
+# Keycloak Admin Credentials
+KC_BOOTSTRAP_ADMIN_USERNAME=admin
+KC_BOOTSTRAP_ADMIN_PASSWORD=admin
+
+# PostgreSQL Credentials for Keycloak
+POSTGRES_DB=keycloak
+POSTGRES_USER=keycloak
+POSTGRES_PASSWORD=keycloak-password
+
+# Keycloak Web Client Credentials
+WEB_CLIENT_SECRET=replace-with-web-app-client-secret-from-keycloak