feat: add NATS + Dapr infrastructure for event-driven architecture

- infra/compose/nats.yml: NATS server with JetStream, persistence volume, healthcheck
- infra/compose/dapr.yml: Dapr placement service for sidecar coordination
- infra/dapr/: Dapr global config, pubsub component (NATS), statestore (Redis)
- infra/compose/scraper.yml: add Dapr sidecar container + depends_on nats/dapr
- docs/add-dapr-service.md: guide for integrating Dapr into new services
- docs/add-new-app.md: add Dapr sidecar step
- ARCHITECTURE.md: add NATS/Dapr to infra table + service mesh diagram
- infra/README.md: update layout and deployment order
- deploy-docker.yml: add nats.yml + dapr.yml to ALL_COMPOSE_FILES

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/add-new-app.md

@@ -52,6 +52,44 @@ networks:
 
 Gunakan `app-shared-net` agar service dapat diakses oleh Traefik dan service lain.
 
+## 3.5. Tambahkan Dapr sidecar (wajib untuk pub/sub)
+
+Setiap service yang ingin menggunakan Dapr pub/sub atau service invocation harus punya sidecar.
+Tambah di `infra/compose/<nama-app>.yml`:
+
+```yaml
+  <nama-app>-dapr:
+    container_name: <nama-app>-dapr
+    image: daprio/daprd:latest
+    restart: always
+    depends_on:
+      dapr-placement:
+        condition: service_healthy
+      nats:
+        condition: service_healthy
+    networks:
+      - app-shared-net
+    command:
+      - './daprd'
+      - '--app-id=<nama-app>'
+      - '--app-port=<port>'
+      - '--dapr-http-port=3500'
+      - '--dapr-grpc-port=50001'
+      - '--placement-host-address=dapr-placement:50005'
+      - '--components-path=/components'
+    volumes:
+      - ../../infra/dapr/components:/components
+```
+
+Pastikan juga app container punya `depends_on` ke dapr-placement dan nats:
+```yaml
+    depends_on:
+      dapr-placement:
+        condition: service_healthy
+      nats:
+        condition: service_healthy
+```
+
 ## 4. Tambahkan route Traefik
 
 Update `infra/traefik/dynamic/apps.yaml`: