Respect explicit init boolean flags

[bryantgillespie]

Summary

• Skip install dependency and git init prompts when the user explicitly passes the boolean flags or their aliases.
• Extract init prompt helpers so the command file lints cleanly.

Verification

• pnpm exec eslint src/commands/init.ts
• pnpm run build

Closes #107

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Skips the interactive prompts for installing dependencies and initializing git when the user explicitly passes those boolean flags (or their negated forms) on the command line, and refactors the interactive flow into smaller helpers so the file passes lint.

Changes:

• Adds hasBooleanFlag to detect explicit boolean flag presence in argv and uses it to bypass the install-deps/git-init confirms.
• Extracts confirmBooleanFlag, confirmOverwriteDirectory, promptForTargetDirectory, and promptForValidTemplate helpers from runInteractive.
• Tightens types (select<string>, TemplateInfo) and replaces .find with .some in the frontend validity check.

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[LZylstra]

LGTM