feat(01-01): install Go 1.24, initialize module, create shared types

- Initialize Go module github.com/netsynth/netsynth with Go 1.24.1
- Create classify/types.go with 11 TrafficClass constants (ICMP, DNS, HTTPS,
  HTTP, SSH, SMTP, NTP, DHCP, other-TCP, other-UDP, unknown)
- Add ClassifiedPacket and WindowSnapshot shared types
- Add Phase 1 dependencies: gopacket v1.5.0, go-pcap, cobra v1.10.2

go.sum

@@ -0,0 +1,27 @@
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