feat: add Vaultwarden password manager module

[igorpecovnik]

Add support for Vaultwarden, an alternative Bitwarden server implementation written in Rust.

Features:

• Lightweight alternative to official Bitwarden server
• SQLite database (no external database needed)
• Simple single-container setup
• Full Bitwarden API compatibility including:
  • Organizations support
  • Attachments
  • Vault API support
  • Website icons API
  • Authenticator and U2F support
  • YubiKey and Duo support

Module follows established patterns:

• Uses docker_operation_progress for all operations
• Uses docker_manage_base_dir for data directory
• Uses docker_is_installed for status checks
• Uses show_module_help for help display
• Includes PUID/PGID for proper file permissions
• Port 8080 by default (container port 80)

Note: HTTPS required for web vault access due to Web Crypto API restrictions in modern browsers. Users should configure reverse proxy with SSL for production use.

Description

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Implementation Details

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• Key changes introduced by this PR
• Justification for the changes
• Confirmation that no new external dependencies or modules have been introduced

Documentation Summary

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Testing Procedure

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• Test 1: Description and results
• Test 2: Description and results

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have ensured that my changes do not introduce new warnings or errors
• No new external dependencies are included
• Changes have been tested and verified
• I have included necessary metadata in the code, including associative arrays

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• Commit unit tests in branch support-vaultwarden

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