feat(org): show inherited org branch-protection rules in repo settings (#727)

The org "floor" is enforced implicitly at the choke point, so a repo admin
couldn't see which org-level rules apply to their repo. Surface them in the
repo's Branch Protection settings page (read-only), the way GitHub shows
organization rulesets in a repository.

- ProtectedBranchRules handler: when the owner is an org, load
  FindOrgProtectedBranchRules and expose them as OrgProtectedBranches.
- branches.tmpl: new read-only "Organization Branch Protection" section listing
  each org rule with an "Organization" badge, a lock/read-only marker, and
  compact indicators (required approvals, signed commits, status checks). No
  edit/delete controls — these are managed at the org level.
- en-US locale strings.

Note: no Go toolchain available locally, so not compiled/gofmt'd/tested here.

Claude-Session: https://claude.ai/code/session_01Wsno14cxE49MstXFs9G5KT

options/locale/locale_en-US.json

@@ -2411,6 +2411,13 @@
   "repo.settings.protected_branch": "Branch Protection",
   "repo.settings.protected_branch.save_rule": "Save Rule",
   "repo.settings.protected_branch.delete_rule": "Delete Rule",
+  "repo.settings.org_protected_branch": "Organization Branch Protection",
+  "repo.settings.org_protected_branch_desc": "These rules are defined by the organization and are enforced on top of this repository's own rules — the stricter of the two applies. They cannot be edited here.",
+  "repo.settings.org_protected_branch.inherited": "Organization",
+  "repo.settings.org_protected_branch.read_only": "Read-only",
+  "repo.settings.org_protected_branch.approvals": "%d approvals required",
+  "repo.settings.org_protected_branch.signed": "Signed commits",
+  "repo.settings.org_protected_branch.status_check": "Status checks",
   "repo.settings.protected_branch_can_push": "Allow push?",
   "repo.settings.protected_branch_can_push_yes": "You can push",
   "repo.settings.protected_branch_can_push_no": "You cannot push",

routers/web/repo/setting/protected_branch.go

@@ -46,6 +46,18 @@ func ProtectedBranchRules(ctx *context.Context) {
 	}
 	ctx.Data["ProtectedBranches"] = rules
 
+	// Surface the organization-level rules that also apply to this repo (read-only),
+	// so admins can see the org "floor" that is layered on top of the repo's own
+	// rules at enforcement time. See issue #727.
+	if ctx.Repo.Owner.IsOrganization() {
+		orgRules, err := git_model.FindOrgProtectedBranchRules(ctx, ctx.Repo.Owner.ID)
+		if err != nil {
+			ctx.ServerError("FindOrgProtectedBranchRules", err)
+			return
+		}
+		ctx.Data["OrgProtectedBranches"] = orgRules
+	}
+
 	repo.PrepareBranchList(ctx)
 	if ctx.Written() {
 		return

templates/repo/settings/branches.tmpl

@@ -62,6 +62,33 @@
 					{{end}}
 				</div>
 			</div>
+
+			{{if .OrgProtectedBranches}}
+				<h4 class="ui top attached header">
+					{{ctx.Locale.Tr "repo.settings.org_protected_branch"}}
+				</h4>
+				<div class="ui attached segment">
+					<p class="tw-mb-3">{{ctx.Locale.Tr "repo.settings.org_protected_branch_desc"}}</p>
+					<div class="flex-divided-list items-with-main">
+						{{range .OrgProtectedBranches}}
+							<div class="item tw-items-center">
+								<div class="item-main">
+									<div class="item-title tw-flex tw-items-center tw-gap-2 tw-flex-wrap">
+										<div class="ui basic label">{{.RuleName}}</div>
+										<span class="ui tiny label">{{svg "octicon-organization" 12}} {{ctx.Locale.Tr "repo.settings.org_protected_branch.inherited"}}</span>
+										{{if gt .RequiredApprovals 0}}<span class="ui tiny basic label">{{ctx.Locale.Tr "repo.settings.org_protected_branch.approvals" .RequiredApprovals}}</span>{{end}}
+										{{if .RequireSignedCommits}}<span class="ui tiny basic label">{{ctx.Locale.Tr "repo.settings.org_protected_branch.signed"}}</span>{{end}}
+										{{if .EnableStatusCheck}}<span class="ui tiny basic label">{{ctx.Locale.Tr "repo.settings.org_protected_branch.status_check"}}</span>{{end}}
+									</div>
+								</div>
+								<div class="item-trailing">
+									<span class="text grey tw-text-sm">{{svg "octicon-lock" 14}} {{ctx.Locale.Tr "repo.settings.org_protected_branch.read_only"}}</span>
+								</div>
+							</div>
+						{{end}}
+					</div>
+				</div>
+			{{end}}
 		{{end}}
 	</div>