Rework notifications system

[Flaminel]

No description provided.

[Copilot]

Pull Request Overview

This PR implements a comprehensive rework of the notifications system, migrating from a form-based configuration to a modal-based provider management approach with separate notification providers (Notifiarr and Apprise).

Key changes:

• Rewrote frontend notification settings to use provider-specific modals instead of a single form
• Refactored backend notification architecture to use a provider-based pattern with configuration service
• Updated database schema to support multiple notification providers with separate configurations

Reviewed Changes

Copilot reviewed 65 out of 66 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
docs/docs/configuration/notifications/index.mdx	Added provider configuration documentation
code/frontend/src/app/shared/models/	New TypeScript models for notification providers and enums
code/frontend/src/app/settings/notification-settings/	Complete rewrite to modal-based UI with provider management
code/frontend/src/app/core/services/	New notification provider service and updated documentation service
code/backend/Cleanuparr.Persistence/	Database schema changes for new notification provider architecture
code/backend/Cleanuparr.Infrastructure/	Refactored notification system to use provider factory pattern

Files not reviewed (1)

• code/backend/Cleanuparr.Persistence/Migrations/Data/20250830230846_ReworkNotificationSystem.Designer.cs: Language not supported

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