Core packages: config validation, network renderers, root helper, auth, SQLite store, capture engine

Capture engine streams dumpcap pcapng into verbatim, hashed segments with
per-segment tshark summaries; display filters, PDML dissection with verified
byte ranges, export and import. Tests run in a Debian trixie container.

migrations/embed.go

@@ -0,0 +1,7 @@
+// Package migrations embeds the ordered SQL schema migrations.
+package migrations
+
+import "embed"
+
+//go:embed *.sql
+var FS embed.FS