chore: remove Kestra and integrator legacy services

Migration to Airflow + Meltano pipeline is complete. Remove:
- kestra, kestra-init, integrator services from docker-compose.portainer.yml
- kestra_storage and supplementary_data volumes
- KESTRA_USER/KESTRA_PASSWORD env var references
- integrator/ directory (Kestra flows, scripts, Dockerfiles)

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

docker-compose.portainer.yml

@@ -7,9 +7,7 @@
 #   ADMIN_API_KEY          — Backend admin API key
 #   TYPESENSE_API_KEY      — Typesense admin API key
 #   TYPESENSE_SEARCH_KEY   — Typesense search-only key (exposed to frontend)
-#   AIRFLOW_ADMIN_USER    — Airflow admin username (password auto-generated, see api-server logs)
-#   KESTRA_USER            — Kestra UI username (optional)
-#   KESTRA_PASSWORD        — Kestra UI password (optional)
+#   AIRFLOW_ADMIN_USER     — Airflow admin username (password auto-generated, see api-server logs)
 
 services:
 
@@ -103,87 +101,6 @@ services:
       retries: 5
       start_period: 10s
 
-  # ── Kestra — workflow orchestrator (legacy, kept during migration) ────
-  kestra:
-    image: kestra/kestra:latest
-    container_name: schoolcompare_kestra
-    command: server standalone
-    ports:
-      - "8090:8080"
-    volumes:
-      - kestra_storage:/app/storage
-    environment:
-      KESTRA_CONFIGURATION: |
-        datasources:
-          postgres:
-            url: jdbc:postgresql://sc_database:5432/kestra
-            driverClassName: org.postgresql.Driver
-            username: ${DB_USERNAME}
-            password: ${DB_PASSWORD}
-        kestra:
-          repository:
-            type: postgres
-          queue:
-            type: postgres
-          storage:
-            type: local
-            local:
-              base-path: /app/storage
-    depends_on:
-      sc_database:
-        condition: service_healthy
-    networks:
-      - backend
-    restart: unless-stopped
-    healthcheck:
-      test: ["CMD-SHELL", "curl -sf http://localhost:8081/health | grep -q '\"status\":\"UP\"'"]
-      interval: 15s
-      timeout: 10s
-      retries: 10
-      start_period: 60s
-
-  # ── Kestra init (legacy, kept during migration) ──────────────────────
-  kestra-init:
-    image: privaterepo.sitaru.org/tudor/school_compare-kestra-init:latest
-    container_name: schoolcompare_kestra_init
-    environment:
-      KESTRA_URL: http://kestra:8080
-      KESTRA_USER: ${KESTRA_USER:-}
-      KESTRA_PASSWORD: ${KESTRA_PASSWORD:-}
-    depends_on:
-      kestra:
-        condition: service_healthy
-    networks:
-      - backend
-    restart: "no"
-
-  # ── Data integrator (legacy, kept during migration) ──────────────────
-  integrator:
-    image: privaterepo.sitaru.org/tudor/school_compare-integrator:latest
-    container_name: schoolcompare_integrator
-    ports:
-      - "8001:8001"
-    environment:
-      DATABASE_URL: postgresql://${DB_USERNAME}:${DB_PASSWORD}@sc_database:5432/${DB_DATABASE_NAME}
-      DATA_DIR: /data
-      BACKEND_URL: http://backend:80
-      ADMIN_API_KEY: ${ADMIN_API_KEY:-changeme}
-      PYTHONUNBUFFERED: 1
-    volumes:
-      - supplementary_data:/data
-    depends_on:
-      sc_database:
-        condition: service_healthy
-    networks:
-      - backend
-    restart: unless-stopped
-    healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:8001/health"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
-      start_period: 15s
-
   # ── Airflow API Server + UI ───────────────────────────────────────────
   airflow-api-server:
     image: privaterepo.sitaru.org/tudor/school_compare-pipeline:latest
@@ -282,7 +199,5 @@ networks:
 
 volumes:
   postgres_data:
-  kestra_storage:
-  supplementary_data:
   typesense_data:
   airflow_logs: