feat(core): record device hostname when cloning repositories

[konard]

Summary

• Add clonedOnHostname field to TemplateConfig that captures os.hostname() during project creation
• Display device hostname in project list (TUI @hostname label), connection info, and API response
• Backward compatible: field is optional in schema, old docker-git.json files without it work fine

Математические гарантии

Инварианты:

• ∀ project ∈ Projects: created(project) → ∃ hostname: persisted(project, hostname)
• ∀ config ∈ OldConfigs: decode(config) = success (backward compatibility)

Предусловия:

• os.hostname() returns a non-empty string (guaranteed by POSIX)

Постусловия:

• ∀ project ∈ NewProjects: project.clonedOnHostname = os.hostname()
• ∀ project ∈ OldProjects: project.clonedOnHostname = undefined

Сложность:

• Время: O(1) — hostname lookup is a constant-time syscall
• Память: O(1) — one additional string field per project config

Changes

File	Change
packages/lib/src/core/domain.ts	Add clonedOnHostname to TemplateConfig interface
packages/lib/src/shell/config.ts	Add optional clonedOnHostname to schema
packages/lib/src/core/command-builders.ts	Set clonedOnHostname: hostname() during create
packages/lib/src/usecases/menu-helpers.ts	Show "Cloned on device" in connection info
packages/lib/src/usecases/projects-core.ts	Add clonedOnHostname to ProjectItem type
packages/app/src/docker-git/menu-render-select.ts	Show @hostname in TUI project list
packages/api/src/api/contracts.ts	Add field to ProjectDetails API type
packages/api/src/services/projects.ts	Pass field through to API response

Test plan

• Existing parser test verifies clonedOnHostname equals os.hostname() for create commands
• New connection-info.test.ts verifies hostname shown when present and hidden when absent
• All typecheck, lint, and tests pass locally

Fixes #187

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[konard]

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