Source bound event rules

[nilmerg]

resolves #354

[Copilot]

Pull Request Overview

This PR introduces source-bound event rules, allowing event rules to be associated with specific sources. This means that each event rule can now filter events from a particular source (e.g., Icinga 2, Kubernetes), making the notification system more flexible and organized. The change addresses issue #354.

Key changes include:

• Adding a source_id foreign key to the rule table
• Introducing a SourceHook interface for extensible source integrations
• Refactoring the source configuration form to use hook-based integrations
• Updating the event rule forms to include source selection

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
public/css/mixins.less	Adds styling to remove text decoration from button links
public/css/form.less	Adds styling for form descriptions and button-links in form controls
public/css/detail/event-rule-detail.less	Updates filter control styling and button wrappers
library/Notifications/Model/Source.php	Adds icon caching and hook-based icon retrieval
library/Notifications/Model/Rule.php	Adds source_id column and relation to Source model
library/Notifications/Hook/V1/SourceHook.php	Defines new interface for source integrations
library/Notifications/Common/Links.php	Adds helper method for source addition link
doc/03-Configuration.md	Updates documentation for source configuration
doc/01-About.md	Updates documentation to clarify source integrations
application/forms/SourceForm.php	Refactors form to use hook-based source integrations
application/forms/EventRuleForm.php	Adds source selection to event rule form
application/forms/EventRuleConfigForm.php	Updates to handle source_id in rule configuration
application/forms/DeleteSourceForm.php	New form for source deletion with cascade handling
application/controllers/SourcesController.php	Updates to handle hook-based source addition
application/controllers/SourceController.php	Separates delete action into dedicated controller action
application/controllers/EventRulesController.php	Adds source validation before rule creation
application/controllers/EventRuleController.php	Integrates hook-based filter editor for rules

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[sukhwinder33445]

There are some minor ui issues In smaller browser window with two col layout:

The model/form does not apply any padding:

I think we should use the filter icon instead of the cog, it makes the purpose clearer.

[nilmerg]

Merging even though Icinga/icinga-notifications#324 isn't