feat: add non-interactive mode with auto TTY detection

[zhanba]

Summary

• Add global -n/--no-interactive and -y/--yes CLI flags that apply to every subcommand
• Auto-detect non-interactive mode via is-terminal crate (triggers automatically in pipes/CI/scripts)
• find_repo() / select_worktree() now filter by query string in non-interactive mode, exiting 1 with actionable errors on zero/ambiguous matches
• exec_into_dir() prints the resolved path to stdout in non-interactive mode, enabling cd $(pji -n find myrepo) shell integration
• confirm() returns --yes flag value instead of prompting in non-interactive mode
• config gains --root <path> flag; worktree add gains --branch, --new-branch, --base, --path flags

New CLI usage

# Interactive (default in terminal) — unchanged behaviour
pji myrepo
pji worktree add

# Non-interactive (auto-detected in pipes/CI, or explicit -n)
pji -n find myrepo               # prints path, exits 0
cd $(pji -n find myrepo)         # cd shell integration
pji -n find myrepo | xargs code  # open in editor

pji config --root ~/projects     # add root without TUI
pji -n -y remove git@github.com:org/repo.git  # skip confirmation

pji -n worktree add --branch feat/x --new-branch --base main
pji -n worktree switch feat/x
pji -n worktree remove feat/x

Test plan

• Run pji myrepo in a terminal — fuzzy TUI still appears as before
• Run pji -n find myrepo — prints the repo path and exits
• Run cd $(pji -n find myrepo) — changes directory successfully
• Run pji -n find ambiguous with multiple matches — exits 1 with list
• Run pji -n find nomatch — exits 1 with clear error message
• Run echo "" | pji find myrepo — auto-detects non-TTY, prints path
• Run pji config --root ~/projects — adds root without interactive prompt
• Run pji -n worktree add --branch feat/x --new-branch — creates worktree without TUI
• Run pji -n -y worktree remove feat/x — removes without confirmation

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