feat: add ja4ebpf service — eBPF-based TLS/TCP fingerprinting daemon

- TC ingress hook captures TCP SYN (L3/L4) and TLS ClientHello
- Uprobes on SSL_read/SSL_set_fd capture decrypted TLS data
- Kprobes on accept4 correlate socket FDs to client IP:port
- JA4 fingerprint computed from parsed TLS ClientHello
- HTTP/2 SETTINGS and WINDOW_UPDATE extracted from decrypted streams
- Session manager with sharded map (256 shards) and GC goroutine
- Slowloris detection: sessions with no requests after 10s threshold
- ClickHouse batch writer to ja4_logs.http_logs_raw (raw_json)
- All tests pass: 17 parser + 10 correlation tests

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

go.work

@@ -4,4 +4,5 @@ use (
     ./services/sentinel
     ./services/correlator
     ./shared/go/ja4common
+    ./services/ja4ebpf
 )