feat(worktree): interactive add-repo, config scope, and clean command

[EndersonPro]

Summary

This PR delivers three substantial UX and infrastructure improvements to flutree:

• Interactive add-repo wizard — replaces the basic numeric selection with a Bubble Tea–powered multi-select UI using arrow keys, space to toggle, and an explicit review/confirm step before mutations. Includes full PTY-based integration tests for apply and cancel paths.
• Persisted scope.root config — new config set/get scope.root commands that persist a default discovery root path with precedence (--scope flag > persisted config > . fallback). Includes validation for invalid/non-directory/unreachable paths.
• flutree clean command — new command to clean the current managed worktree, with optional --force to also remove pubspec.lock.

Changes

Commit	Description
7acdcdf	feat(app): add clean/config services and add-repo wizard core
c98a145	feat(cli): wire config, clean, interactive add-repo, and table UX

Files Changed

File	Change
cmd/flutree/main.go	New clean command, config set/get handlers, interactive add-repo wiring with TTY gating
internal/ui/add_repo_wizard.go	New Bubble Tea wizard model with multi-select, review, and confirm steps
internal/ui/add_repo_wizard_test.go	New unit tests for wizard state machine (navigation, toggle, cancel, apply)
internal/app/config_service.go	New config service with SetScopeRoot/GetScopeRoot and validation
internal/app/scope_resolver.go	New scope precedence resolver (--scope > config > .)
internal/app/clean_service.go	New clean service with force mode and lock removal
internal/infra/config/repository.go	New versioned JSON config persistence with atomic writes
internal/ui/table.go	Migrated flutree list to lipgloss/table with width-aware truncation
integration/cli_contract_test.go	PTY harness, PTY tests for wizard apply/cancel, config roundtrip, precedence coverage
docs/usage.md, README.md	Updated usage documentation

Test Plan

• go test ./... → 183 passed, 0 failed
• go vet ./... → no issues
• PTY-based integration tests for interactive apply and cancel paths
• Config set/get roundtrip integration tests
• Scope precedence integration tests for create and add-repo

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