geolocation: add CLI to update user payment token account

[ben-dz]

Summary of Changes

• Add user update subcommand to doublezero-geolocation that submits the existing on-chain UpdateGeolocationUser instruction (previously unreachable from the CLI)
• Subcommand takes --user <code-or-pubkey> (resolved via GetGeolocationUserCommand, mirroring delete) and --token-account <pubkey>, then issues the update against the resolved code
• Extends the GeoCliCommand trait with update_geolocation_user so the new CLI path goes through the same mockable boundary as the rest of the geolocation CLI

Diff Breakdown

Category	Files	Lines (+/-)	Net
Core logic	1	+35 / -0	+35
Scaffolding	4	+15 / -1	+14
Tests	1	+67 / -0	+67

Almost entirely additive: one new CLI command file (production + tests) plus thin wiring in four existing files (trait method, subcommand enum, dispatch, mod declaration).

Key files (click to expand)

• smartcontract/cli/src/geolocation/user/update.rs — new UpdateGeolocationUserCliCommand (clap struct + execute) and a unit test asserting the command resolves the user and emits the expected SDK call
• smartcontract/cli/src/geoclicommand.rs — adds update_geolocation_user to the GeoCliCommand trait and GeoCliCommandImpl
• client/doublezero-geolocation-cli/src/cli/user.rs — adds the Update variant to UserCommands and re-exports the new CLI struct
• client/doublezero-geolocation-cli/src/main.rs — dispatches UserCommands::Update to args.execute(&client, &mut handle)
• smartcontract/cli/src/geolocation/user/mod.rs — registers the new update module

Testing Verification

• New unit test test_cli_update_geolocation_user verifies the CLI resolves a user by code and submits UpdateGeolocationUserCommand { code, token_account: Some(..) }
• cargo test -p doublezero_cli geolocation::user — 28/28 passing including the new test
• cargo build -p doublezero_cli -p doublezero-geolocation-cli clean
• cargo clippy -p doublezero_cli -p doublezero-geolocation-cli --all-targets -- -Dclippy::all -Dwarnings clean