🚀 ci(picture): add picture app to CI/CD deployment pipeline

- Add picture-backend and picture-web to CI Docker build matrix
- Add picture services to staging deployment workflow
- Add picture-backend to production deployment workflow
- Create Dockerfile and docker-entrypoint.sh for picture-web
- Fix picture-backend Dockerfile port (3003→3006) and health endpoint
- Add picture routes to Caddyfile.staging
- Add REPLICATE_API_TOKEN and MANA_CORE_SERVICE_KEY env vars

docker/caddy/Caddyfile.staging

@@ -43,3 +43,11 @@ todo.staging.manacore.ai {
 todo-api.staging.manacore.ai {
     reverse_proxy localhost:3018
 }
+
+# Picture
+picture.staging.manacore.ai {
+    reverse_proxy localhost:5175
+}
+picture-api.staging.manacore.ai {
+    reverse_proxy localhost:3006
+}