T18: stack swarm docker — image web+scan, scan_loop.py, mariadb bind-mount server5.saltis.id

- Dockerfile (web) + Dockerfile.scan (scan; sertakan tzdata) + .dockerignore
- scan_loop.py: jadwal skan SCAN_HOURS (0,8,16 lokal via TZ) + skan-awal SCAN_RUN_ON_START; loop tak keluar; tunggu DB siap
- docker-compose.yml → STACK SWARM produksi (mariadb bind mount /data/db/mariadb/databisnisid/data + placement node.hostname == server5.saltis.id; web :5000; scan); image dari registry git.proit.id/proitlab/databisnisid-{web,scan}
- docker-compose.dev.yml: mariadb uji lokal (127.0.0.1:3306) — pengganti docker-compose.yml lama
- SPEC.md §V18/T18; AGENTS.md runbook swarm + dev compose
- .env.example: TZ/SCAN_HOURS/SCAN_RUN_ON_START/MARIADB_*

.dockerignore

@@ -0,0 +1,9 @@
+# Artifak runtime & env lokal — jangan masuk build context
+venv/
+.git/
+.env
+voters.db
+.oc/
+__pycache__/
+*.pyc
+*.log