fix(deployments): fix broken config mount and expand env example

- Fix docker-compose.yaml: mount config.dev.yaml instead of nonexistent
  configs/config.yaml
- Add deployments/config.dev.yaml with Docker service names and dev
  defaults for zero-setup make docker-up
- Expand .env.example with all SILO_* and LDAP_* variables
- Update config.example.yaml hostnames to localhost with Docker comments
- Add deployments/config.docker.yaml to .gitignore (generated file)

.env.example

@@ -1,12 +1,26 @@
 # Silo Environment Configuration
-# Copy this file to .env and update values as needed
+# Copy to .env (or deployments/.env) and update values as needed.
+# For automated setup, run: ./scripts/setup-docker.sh
 
 # PostgreSQL
 POSTGRES_PASSWORD=silodev
 
 # MinIO
-MINIO_ACCESS_KEY=minioadmin
-MINIO_SECRET_KEY=minioadmin
+MINIO_ACCESS_KEY=silominio
+MINIO_SECRET_KEY=silominiosecret
 
-# Silo API (optional overrides)
-# SILO_SERVER_PORT=8080
+# OpenLDAP
+LDAP_ADMIN_PASSWORD=ldapadmin
+LDAP_USERS=siloadmin
+LDAP_PASSWORDS=siloadmin
+
+# Silo Authentication
+SILO_SESSION_SECRET=change-me-in-production
+SILO_ADMIN_USERNAME=admin
+SILO_ADMIN_PASSWORD=admin
+
+# Optional: OIDC (Keycloak)
+# SILO_OIDC_CLIENT_SECRET=
+
+# Optional: LDAP service account
+# SILO_LDAP_BIND_PASSWORD=