chore: suppression des services obsolètes (sentinel, correlator, mod-reqin-log)

Remplacés par l'agent ja4ebpf (eBPF CO-RE). Nettoyage complet :

Supprimé :
- old/ (archive de l'ancienne architecture)
- services/correlator/ (logcorrelator Go)
- services/sentinel/ (capture pcap Go)
- services/mod-reqin-log/ (module Apache C)
- shared/go/ja4common/ (lib Go partagée — plus importée par ja4ebpf)
- tests/integration/platform/ (test correlator+sentinel+httpd)
- tests/integration/docker-compose.yml (compose ancienne archi)
- tests/integration/run-tests.sh (runner correlator/sentinel)
- tests/integration/verify_mvs.py (script orphelin)

Nettoyé :
- go.work : retire ./shared/go/ja4common
- services/ja4ebpf/go.mod : retire replace ja4common (jamais importé)
- services/ja4ebpf/Dockerfile* : retire les COPY ja4common inutiles
- Makefile : retire test-ja4common-python, test-integration*, targets obsolètes
- tests/integration/README.md : réécrit pour l'architecture ja4ebpf

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

go.work.sum

@@ -1,2 +0,0 @@
-github.com/ClickHouse/clickhouse-go v1.5.4 h1:cKjXeYLNWVJIx2J1K6H2CqyRmfwVJVY1OV1coaaFcI0=
-github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=