feat(cli): add project selector to service commands

[half0wl]

Summary

Adds --project support across service-scoped CLI commands so automation can target a project without first linking the working directory. This centralizes project/environment/service resolution in a shared resolver and keeps existing linked-project behavior as the default. Commands that accept --project require --environment to avoid ambiguous cross-project environment resolution.

Changes

• Add --project support to service-scoped commands including logs, metrics, variables, service list/status/delete, redeploy, restart, down, scale, shell, connect, volume, and domain.

• Introduce shared service context resolution for project, environment, and service IDs.

• Preserve linked project/environment/service fallbacks when --project is omitted.

• Preserve single-service fallback behavior for commands that can infer the target service.

• Use --project without a short flag for domain because -p is already used for --port.

• Adds --project to:

  • railway logs
  • railway metrics
  • railway variable
  • railway variable list
  • railway variable set
  • railway variable delete
  • railway service list
  • railway service status
  • railway service delete
  • railway redeploy
  • railway restart
  • railway down
  • railway scale
  • railway service scale
  • railway shell
  • railway connect
  • railway volume
  • railway domain

• Note: railway domain gets --project only, not -p, because -p is already --port.

Test plan

• cargo fmt
• cargo check
• cargo test
• Manually verified service status --project ... --environment ... --service ... --json
• Manually verified logs --project ... --environment ... --service ... --lines 1 --json
• Manually verified metrics --project ... --environment ... --service ... --json --cpu

[Copilot]

Pull request overview

This PR adds --project support to service-scoped CLI commands to allow targeting a project in automation without requiring a linked working directory, and centralizes project/environment/service resolution in a shared resolver while preserving linked-project defaults.

Changes:

• Introduces resolve_service_context(project, service, environment) to consistently resolve project/environment/service IDs (with linked fallbacks and single-service inference).
• Adds --project (and, in many cases, --environment when --project is used) across multiple service-scoped commands (logs, metrics, variable, shell, scale, restart/redeploy/down, service operations, volume, domain, connect).
• Refactors commands to use the new resolver or shared project/environment selection logic, while maintaining existing linked behavior when --project is omitted.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/errors.rs	Suppresses dead-code for an unused error variant after refactors.
src/controllers/project.rs	Adds centralized service context resolver supporting explicit --project and single-service inference.
src/commands/volume.rs	Adds --project and updates volume flow to resolve project/env/service accordingly.
src/commands/variable.rs	Adds --project to variable subcommands and routes resolution through shared resolver.
src/commands/shell.rs	Adds --project/--environment and uses shared resolver for selecting service context.
src/commands/service.rs	Adds --project handling for list/status/delete flows and updates linked fallbacks.
src/commands/scale.rs	Adds --project support and adjusts linked-service fallback plumbing.
src/commands/restart.rs	Adds --project/--environment and switches to shared resolver for service targeting.
src/commands/redeploy.rs	Adds --project/--environment and switches to shared resolver for service targeting.
src/commands/metrics.rs	Adds --project and updates project/environment/service selection logic accordingly.
src/commands/logs.rs	Adds --project and switches to shared resolver for service context.
src/commands/down.rs	Adds --project and switches to shared resolver for service context.
src/commands/domain.rs	Adds --project (long-only) and switches domain flows to shared resolver.
src/commands/connect.rs	Adds --project and updates project/env resolution in connect flow.

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