feat(export): Export Exclusion for PCAP/text (11.0.231)

[adubovikov]

Summary

• Restores Homer 7 Export Exclusion: exclude selected IPs from transaction PCAP/text export via whitelist on TransactionSessionRequest (legacy field name — IPs to remove, not allow).
• Backend: SQL filter in buildTransactionExportSQL applies to direct export and share links (POST /export/link stored payload).
• UI: multiselect on Export tab; defaults from Advanced export/transaction/excludedCIDR and session hosts + IP aliases.
• Docs/OpenAPI updated; unit tests for SQL clause and share payload round-trip.
• Version: 11.0.231 (src/version.go)

Closes parity gap discussed in #762

Test plan

• Export PCAP/text without whitelist — unchanged behavior
• Select infrastructure IPs in Export Exclusion — PCAP has no packets with those src/dst IPs
• Advanced excludedCIDR pre-selects on tab open
• Create share link with exclusions — public GET pcap/text honors filter
• go test ./coordinator/handlers/ -run Export -count=1 (from src/)

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