Feature: Add per-runner “Disable/Pause” (#36776)

This PR adds per-runner disable/enable support for Gitea Actions so a
registered runner can be paused from picking up new jobs without
unregistering.

Disabled runners stay registered and online but are excluded from new
task assignment; running tasks are allowed to finish. Re-enabling
restores pickup, and runner list/get responses now expose disabled
state.

Also added an endpoint for testing
http://localhost:3000/devtest/runner-edit/enable

<img width="1509" height="701" alt="Bildschirmfoto 2026-02-27 um 22 13
24"
src="https://github.com/user-attachments/assets/5328eda9-e59c-46b6-b398-f436e50ee3da"
/>


Fixes: https://github.com/go-gitea/gitea/issues/36767

routers/api/v1/swagger/options.go

@@ -225,6 +225,9 @@ type swaggerParameterBodies struct {
 	// in:body
 	UpdateVariableOption api.UpdateVariableOption
 
+	// in:body
+	EditActionRunnerOption api.EditActionRunnerOption
+
 	// in:body
 	LockIssueOption api.LockIssueOption
 }