feat: remove migrated environment/app/deployment/runtime code from SaaS

- Delete environment/, app/, deployment/, runtime/ packages (source + tests)
- Delete apikey/ package (tied to environments, table will be dropped)
- Strip AsyncConfig to empty @EnableAsync (no more deploymentExecutor bean)
- Remove EnvironmentService dependency from TenantService
- Remove environment/app isolation from TenantIsolationInterceptor
- Remove environment seeding from BootstrapDataSeeder
- Refactor ServerApiClient to use LogtoConfig instead of RuntimeConfig
- Add server-endpoint property to LogtoConfig (was in RuntimeConfig)
- Remove runtime config section and multipart config from application.yml

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/main/resources/application.yml

@@ -5,10 +5,6 @@ server:
 spring:
   application:
     name: cameleer-saas
-  servlet:
-    multipart:
-      max-file-size: 200MB
-      max-request-size: 200MB
   datasource:
     url: ${SPRING_DATASOURCE_URL:jdbc:postgresql://postgres:5432/cameleer_saas}
     username: ${SPRING_DATASOURCE_USERNAME:cameleer}
@@ -44,15 +40,4 @@ cameleer:
     m2m-client-secret: ${LOGTO_M2M_CLIENT_SECRET:}
     spa-client-id: ${LOGTO_SPA_CLIENT_ID:}
     audience: ${CAMELEER_OIDC_AUDIENCE:https://api.cameleer.local}
-  runtime:
-    max-jar-size: 209715200
-    jar-storage-path: ${CAMELEER_JAR_STORAGE_PATH:/data/jars}
-    base-image: ${CAMELEER_RUNTIME_BASE_IMAGE:gitea.siegeln.net/cameleer/cameleer-runtime-base:latest}
-    docker-network: ${CAMELEER_DOCKER_NETWORK:cameleer}
-    agent-health-port: 9464
-    health-check-timeout: 60
-    deployment-thread-pool-size: 4
-    container-memory-limit: ${CAMELEER_CONTAINER_MEMORY_LIMIT:512m}
-    container-cpu-shares: ${CAMELEER_CONTAINER_CPU_SHARES:512}
-    cameleer3-server-endpoint: ${CAMELEER3_SERVER_ENDPOINT:http://cameleer3-server:8081}
-    domain: ${DOMAIN:localhost}
+    server-endpoint: ${CAMELEER3_SERVER_ENDPOINT:http://cameleer3-server:8081}