Geolocation: Add CLI for Probe Management

[ben-dz]

Closes #2955

Summary

• Add standalone doublezero-geolocation CLI binary with full probe CRUD and parent-device management
• Integrate geolocation commands into the doublezero_cli library crate with a mockable GeoCliCommand trait, enabling unit testing for all command handlers
• Add geo_program_id field to the shared SDK config so the geolocation program ID can be persisted via config set and resolved automatically
• Fix RPC get_program_accounts deserialization failure by explicitly requesting base64 encoding in the list command

Details

CLI structure: The new binary (client/doublezero-geolocation-cli/) uses clap with three top-level subcommands: config (local config get/set), probe (full CRUD + parent management), and init-config (onchain program config initialization). Config resolution follows the pattern: explicit CLI flag > local config file > hardcoded default.

Integration path: All geolocation command logic lives in smartcontract/cli/src/geolocation/, reusing the existing CLI crate's validators and patterns. Commands are generic over GeoCliCommand and write to a Write trait object, making them independently testable. Should allowmerging into the main doublezero CLI.

Config set supports --env shorthand: Running config set --env devnet sets RPC URL, WS URL, program IDs, and the new geo program ID all at once.

Testing Verification

• Unit tests for all probe commands and config commands using MockGeoCliCommand with predicate assertions
• Verified list output in table, JSON, and compact JSON formats
• Confirmed base64 encoding fix resolves get_program_accounts deserialization on devnet
• Manual testing on a localnet with current versions of the onchain program and rust SDK.