cli/serviceability: move per-resource subcommand wrappers into module crate

[juan-malbeclabs]

RFC-20 implementation stack

This PR is part of a 9-PR chain delivering RFC-20: CLI standardization. Each PR's diff is only its own contribution; reviewers should consume them in order.

#	PR	Scope
1	#3753	doublezero-cli-core foundation crate + solana_l1_rpc_url
2	#3754	--solana-url + --log-verbose global flags + tracing init
3	#3755	CliContext built in main + centralized error rendering
4	#3756	rename doublezero_cli → doublezero-serviceability-cli
5	#3757	rewrite location get as the async + CliContext reference verb
6	#3758	docs/cli-standard.md + CLAUDE.md pointer
7	#3759	move per-resource subcommand wrappers into the module crate
8	#3760	add ServiceabilityCommand enum + async dispatcher
9	#3761	#[command(flatten)] + collapse binary dispatch

This PR: #3759 — position 7 of 9. Previous: #3758 · Next: #3760

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Summary of Changes

• Moves the 13 per-resource serviceability subcommand wrapper files (accesspass, config, contributor, device, exchange, globalconfig, link, location, multicastgroup, permission, resource, tenant, user) from client/doublezero/src/cli/ into the doublezero-serviceability-cli module crate at smartcontract/cli/src/cli/, per RFC-20 §Module contract item 2 ("the module crate exports the subcommand enum").
• Adds smartcontract/cli/src/cli/mod.rs and pub mod cli; in the library's lib.rs so the new module is reachable.
• Rewrites import paths in the moved files (doublezero_serviceability_cli::<resource>::* -> crate::<resource>::*) and in the binary (client/doublezero/src/{cli/command.rs,main.rs} switch to doublezero_serviceability_cli::cli::<resource>::* for the moved types).
• cli/multicast.rs stays in the binary: its Subscribe, Unsubscribe, Publish, and Unpublish variants are async and their execute impls live in client/doublezero/src/command/multicast.rs (binary-local), depending on ServiceControllerImpl and crate::command::helpers::resolve_client_ip. The binary's cli/multicast.rs now imports MulticastGroupCliCommand from the library.
• No Command enum reshape, no main.rs dispatch change. Pure file relocation. The next PR adds the top-level ServiceabilityCommand enum; the PR after that wires it into the binary via #[command(flatten)] and collapses the dispatch.

Diff Breakdown

Category	Files	Lines (+/-)	Net
Scaffolding	19	+75 / -32	+43
Docs	1	+1 / -0	+1
Total	20	+76 / -32	+44

Pure file moves (tracked as renames in git, ~95% similarity each) plus import-path rewrites in the binary and the new library cli/mod.rs. Behavior unchanged.

Key files (click to expand)

• smartcontract/cli/src/cli/mod.rs (new) - declares the 13 moved modules.
• smartcontract/cli/src/lib.rs - adds pub mod cli;.
• client/doublezero/src/cli/mod.rs - keeps only command, geolocation, and multicast (the binary-local ones).
• client/doublezero/src/cli/command.rs - imports MulticastCliCommand from crate::cli and the 13 moved types from doublezero_serviceability_cli::cli::*.
• client/doublezero/src/cli/multicast.rs - imports MulticastGroupCliCommand from the library.
• client/doublezero/src/main.rs - imports the moved subcommand enums (DeviceCommands, LinkCommands, ...) from doublezero_serviceability_cli::cli::*; the per-resource match arms switch from cli::<resource>::*Commands::* to doublezero_serviceability_cli::cli::<resource>::*Commands::*.

Testing Verification

• cargo check --workspace clean.
• make rust-test green workspace-wide (including the cargo test -p doublezero-serviceability-cli location::get reference verb).
• make rust-lint clean.
• cargo run -p doublezero -- --help and cargo run -p doublezero -- device list --help produce the same command tree as before; the relocation is invisible to users.
• Targets jo/6-docs-cli-standard; the diff shown is only this PR's contribution. Follow-ups #PR8 (add ServiceabilityCommand enum) and #PR9 (flatten in binary + collapse dispatch) complete the RFC-20 §Module contract item 2 work.