feat: ja4-platform monorepo — 5 services unified, tests & RPM builds standardized

Services:
- ja4sentinel: TLS/JA4 fingerprint capture daemon (Go, libpcap)
- logcorrelator: JA4 log correlation engine (Go, ClickHouse)
- mod_reqin_log: Apache module (C, JSON request logging)
- bot_detector: ML bot detection pipeline (Python)
- dashboard: FastAPI/Streamlit analytics UI (Python)

Shared libraries:
- shared/go/ja4common: logger, config, shutdown, ipfilter (Go module)
- shared/python/ja4_common: ClickHouseClient, ClickHouseSettings (Python package)
- shared/clickhouse/: canonical SQL migrations (10 files)

Build & packaging:
- Unified 3-stage Dockerfile.package for Go RPMs (el8/el9/el10)
- go.work workspace linking sentinel, correlator, ja4common
- Makefile with test-all, build-all, rpm-* targets

Fixes applied:
- go.work: 1.21 → 1.24.6 (required by sentinel)
- correlator Dockerfiles: golang:1.21 → golang:1.24
- replace directives in go.mod for ja4common local path
- pyproject.toml: setuptools.backends → setuptools.build_meta
- Removed static libpcap linking (unavailable on Rocky 9)
- Fixed data races in output/writers_test.go (sync.Mutex + atomic.Int32)
- Rewrote corrupted test files (logger_test.go × 2)

Test coverage:
- correlator: 67.1% total (unixsocket 80.5%, config 91.7%, app 83.3%, multi 87.7%, stdout 100%)
- sentinel: all 10 packages pass (api, capture, config, fingerprint, ipfilter, logging, output, tlsparse)

Documentation:
- README.md + docs/ (architecture, development, 5 services, shared libs, DB schema & migrations)

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

services/sentinel/packaging/systemd/ja4sentinel.service

@@ -0,0 +1,41 @@
+[Unit]
+Description=JA4 client fingerprinting daemon
+Documentation=https://github.com/your-repo/ja4sentinel
+After=network.target
+Wants=network-online.target
+
+[Service]
+Type=notify
+User=root
+Group=root
+WorkingDirectory=/var/lib/ja4sentinel
+ExecStart=/usr/bin/ja4sentinel --config /etc/ja4sentinel/config.yml
+ExecReload=/bin/kill -HUP $MAINPID
+Restart=on-failure
+RestartSec=5
+WatchdogSec=30
+TimeoutStopSec=2
+NotifyAccess=main
+
+# Security hardening (compatible with root for packet capture)
+ProtectSystem=strict
+ProtectHome=yes
+PrivateTmp=yes
+ProtectKernelTunables=yes
+ProtectKernelModules=yes
+ProtectControlGroups=yes
+RestrictRealtime=yes
+RestrictSUIDSGID=yes
+LockPersonality=yes
+ReadWritePaths=/var/lib/ja4sentinel /var/log/ja4sentinel
+
+# Capabilities for packet capture (inherited by root)
+AmbientCapabilities=CAP_NET_RAW CAP_NET_ADMIN
+CapabilityBoundingSet=CAP_NET_RAW CAP_NET_ADMIN
+
+# Resource limits
+LimitNOFILE=65536
+LimitNPROC=64
+
+[Install]
+WantedBy=multi-user.target