Update Auth Docs

[lbedner]

Update auth docs, dump sync functions in service code, other random stuff.

[Copilot]

Pull Request Overview

This PR restructures the authentication service documentation from a single file into a comprehensive multi-page section and removes synchronous database operations in favor of async-only patterns. The changes improve documentation organization and align the auth service with async-first architectural principles.

• Restructures auth docs into dedicated sections (getting started, API reference, service layer, CLI, examples)
• Removes sync UserService class and consolidates to async-only UserService
• Updates all documentation examples to require explicit database component specification

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
mkdocs.yml	Expands auth documentation navigation from single page to multi-section structure
docs/services/auth/*	Creates new dedicated auth documentation sections with comprehensive guides
docs/services/auth.md	Removes original single-file auth documentation
docs/services/index.md	Updates CLI examples to require explicit database component for auth service
docs/index.md	Updates quick start examples to include required database component
docs/components/index.md	Updates component examples to show explicit database requirement
docs/cli-reference.md	Updates all auth service examples to require explicit database component
app/services/auth/user_service.py	Removes sync UserService class, keeps only async UserService
tests/services/test_auth_integration.py.j2	Updates tests to use async UserService instead of separate AsyncUserService
tests/api/test_auth_endpoints.py.j2	Updates API tests to use unified async UserService
app/services/auth/auth_service.py	Updates import to use unified UserService class
app/components/backend/api/auth/router.py	Updates router to use unified async UserService
app/cli/auth.py.j2	Converts CLI commands to async pattern using asyncio.run()
hooks/post_gen_project.py	Adds cleanup of auth CLI file when auth service is not included

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