feat!: Abusive content reporting (#6977)

This implements milestones 1. and 4. from **Task F. Moderation features: Reporting** (part of [amendment of the workplan](https://codeberg.org/forgejo/sustainability/src/branch/main/2022-12-01-nlnet/2025-02-07-extended-workplan.md#task-f-moderation-features-reporting) for NLnet 2022-12-035):

> 1. A reporting feature is implemented in the database. It ensures that content remains available for review, even if a user deletes it after a report was sent.

> 4. Users can report the most relevant content types (at least: issue comments, repositories, users)

### See also:
- forgejo/discussions#291
- forgejo/discussions#304
- forgejo/design#30

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6977
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Reviewed-by: Otto <otto@codeberg.org>
Co-authored-by: floss4good <floss4good@disroot.org>
Co-committed-by: floss4good <floss4good@disroot.org>

routers/web/web.go

@@ -32,6 +32,7 @@ import (
 	"forgejo.org/routers/web/feed"
 	"forgejo.org/routers/web/healthcheck"
 	"forgejo.org/routers/web/misc"
+	"forgejo.org/routers/web/moderation"
 	"forgejo.org/routers/web/org"
 	org_setting "forgejo.org/routers/web/org/setting"
 	"forgejo.org/routers/web/repo"
@@ -474,6 +475,11 @@ func registerRoutes(m *web.Route) {
 		m.Get("/search", repo.SearchIssues)
 	}, reqSignIn)
 
+	if setting.Moderation.Enabled {
+		m.Get("/report_abuse", reqSignIn, moderation.NewReport)
+		m.Post("/report_abuse", reqSignIn, web.Bind(forms.ReportAbuseForm{}), moderation.CreatePost)
+	}
+
 	m.Get("/pulls", reqSignIn, user.Pulls)
 	m.Get("/milestones", reqSignIn, reqMilestonesDashboardPageEnabled, user.Milestones)