## Summary
- Closes [#10](#10).
- Deploys **SearxNG** on **ai-server-4080** (`10.0.0.128`) for [chat_backend#62](ai_ml_operations/chat_backend#62) / [PR #65](ai_ml_operations/chat_backend#65) grounded search.
- New `roles/searxng/` (compose + JSON-enabled `settings.yml`), gated by `searxng_stack: true`, wired into `site.yml`.
- **Host port 8088** (not 8080 — that is `dta_webapp` on this host). UFW allows `10.0.0.0/24` → `8088/tcp` only.
## Ops after merge
```bash
./scripts/provision.sh ai-server-4080
# or targeted:
ansible-playbook playbooks/site.yml --limit ai-server-4080 --tags never # full site play includes searxng when searxng_stack
```
Then set in `chat_backend_prod.env` / `chat_backend_beta.env`:
```text
SEARCH_PROVIDER=searxng
SEARCH_FAILOVER_PROVIDER=ddgs
SEARXNG_BASE_URL=http://10.0.0.128:8088
```
Smoke test from any app host:
```bash
curl -sG 'http://10.0.0.128:8088/search' --data-urlencode 'q=test' -d 'format=json' | head
```
## Test plan
- [ ] Provision ai-server-4080; confirm `docker ps` shows `searxng`
- [ ] Confirm `:8088` responds with JSON; `:8080` still serves dta_webapp
- [ ] Confirm UFW rule is LAN-only
- [ ] From adama/roslin container network, curl SearxNG succeeds
- [ ] Update chat_backend secrets to `:8088` and redeploy betaReviewed-on: #11
