cli: add auth commands

[stordahl]

Overview

This PR makes two major changes

1. Adds a new command, auth, and three sub-commands
   a. enable - Sets CF_AUTH_ENABLED to true, checks if other auth secrets exist, and prompts the user for a password if they don't
   b. disable - Sets CF_AUTH_ENABLED to false, keeps other auth secrets in place
   c. roll - Allows the user to set a new password
2. Restructures /packages/cli into lib and commands directories to keep things clean after adding more commands

[codecov]

Codecov Report

❌ Patch coverage is 68.09524% with 67 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.11%. Comparing base (412a4e0) to head (337af04).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/cli/src/index.ts	0.00%	62 Missing ⚠️
packages/cli/scripts/generate-secrets.mjs	0.00%	3 Missing ⚠️
packages/cli/src/commands/install.ts	80.00%	1 Missing ⚠️
packages/cli/src/lib/ui.ts	96.55%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #211      +/-   ##
==========================================
- Coverage   78.64%   78.11%   -0.54%     
==========================================
  Files          49       50       +1     
  Lines        3695     3870     +175     
  Branches      483      507      +24     
==========================================
+ Hits         2906     3023     +117     
- Misses        780      838      +58     
  Partials        9        9              

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[Copilot]

Pull Request Overview

This PR adds authentication management commands to the CLI and restructures the codebase for better organization. The changes enable users to manage authentication settings through dedicated CLI commands while maintaining clean separation of concerns.

• Adds new auth command with enable, disable, and role subcommands for managing authentication
• Restructures the project by moving utilities into a lib directory and commands into a commands directory
• Consolidates password prompting functionality into a reusable utility function

Reviewed Changes

Copilot reviewed 12 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/cli/src/lib/ui.ts	Adds reusable password prompting function with validation
packages/cli/src/lib/config.ts	Updates path resolution for new directory structure
packages/cli/src/commands/auth.ts	Implements new authentication management commands
packages/cli/src/commands/install.ts	Updates imports and uses new shared password prompt function
packages/cli/src/index.ts	Adds auth command configuration and updates help behavior
Test files	Updates test imports and adds comprehensive auth command tests

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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