smartcontract: add AccessPassType::EdgeSeat(Pubkey) variant

[juan-malbeclabs]

Summary of Changes

• Add AccessPassType::EdgeSeat(Pubkey) variant to tie an access pass to a specific onchain Seat pubkey, mirroring the existing SolanaValidator(Pubkey) pattern
• Add --accesspass-type edge-seat --seat <PUBKEY> support to access-pass set
• Add --edge-seat and --seat-pubkey filter flags to access-pass list

Diff Breakdown

Category	Files	Lines (+/-)	Net
Core logic	2	+27 / -0	+27
Scaffolding	2	+28 / -0	+28
Tests	1	+107 / -0	+107
Docs	1	+5 / -0	+5

Mostly test additions to cover the two new CLI code paths; core change is small and additive.

Key files (click to expand)

• smartcontract/cli/src/accesspass/set.rs — adds EdgeSeat to CliAccessPassType, --seat arg, match arm in execute(), and two new tests
• smartcontract/programs/doublezero-serviceability/src/state/accesspass.rs — adds EdgeSeat(Pubkey) variant with serde, Display, to_discriminant_string, and Validate (rejects default pubkey)
• smartcontract/cli/src/accesspass/list.rs — adds --edge-seat and --seat-pubkey filter flags
• smartcontract/programs/doublezero-serviceability/src/processors/accesspass/set.rs — adds null-pubkey guard for EdgeSeat matching the existing SolanaValidator check

Testing Verification

• All existing CLI access-pass set tests pass (16 tests unmodified + 2 new: test_cli_accesspass_set_edge_seat_missing_seat and test_cli_accesspass_set_edge_seat_success)
• make rust-lint passes cleanly