Add ntfy support

[Flaminel]

Relates to #178

[Copilot]

Pull Request Overview

This PR adds ntfy notification provider support to enable push notifications through the ntfy service. The implementation includes both self-hosted and public ntfy.sh server support with multiple authentication methods and configurable priority levels.

Key changes:

• Complete ntfy provider implementation with authentication types (None, Basic Auth, Access Token)
• New documentation pages for notification providers with improved organization
• Frontend UI updates for PrimeNG component migration and ntfy-specific configuration
• Backend models, services, and API endpoints for ntfy integration

Reviewed Changes

Copilot reviewed 45 out of 52 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
docs/docs/configuration/notifications/ntfy.mdx	New documentation page for ntfy configuration options
docs/docs/configuration/notifications/notifiarr.mdx	Extracted Notifiarr documentation to separate page
docs/docs/configuration/notifications/apprise.mdx	Extracted Apprise documentation to separate page
docs/docs/configuration/notifications/index.mdx	Reorganized to reference separate provider pages
code/frontend/src/styles.scss	Updated CSS selectors for PrimeNG component migration
code/frontend/src/app/shared/models/ntfy-*.ts	Frontend TypeScript models for ntfy configuration
code/frontend/src/app/settings/notification-settings/modals/ntfy-provider/*	New ntfy provider configuration modal component
code/backend/Cleanuparr.Domain/Enums/Ntfy*.cs	Backend enum definitions for ntfy authentication and priority
code/backend/Cleanuparr.Persistence/Models/Configuration/Notification/NtfyConfig.cs	Database model for ntfy configuration
code/backend/Cleanuparr.Infrastructure/Features/Notifications/Ntfy/*	Ntfy notification provider implementation
code/backend/Cleanuparr.Api/Controllers/ConfigurationController.cs	API endpoints for ntfy provider CRUD operations

Files not reviewed (1)

• code/backend/Cleanuparr.Persistence/Migrations/Data/20250912234118_AddNtfy.Designer.cs: Language not supported

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