fix: move selfupdate routes before hasSuffix stack cases in router

The selfupdate routes were placed after the generic hasSuffix(path, "/update")
stack case, which was catching /selfupdate/update before the specific case
could match it. Moving the selfupdate cases to before all hasSuffix-based
cases fixes the routing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

controller/internal/api/router.go

@@ -63,6 +63,18 @@ func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	case strings.HasPrefix(path, "/stacks/") && req.Method == http.MethodGet && !hasSubpath(path, "/stacks/"):
 		r.getStack(w, req, trimSegment(path, "/stacks/"))
 
+	// GET /api/selfupdate/status — must be before hasSuffix-based stack cases
+	case path == "/selfupdate/status" && req.Method == http.MethodGet:
+		r.selfupdateStatus(w, req)
+
+	// POST /api/selfupdate/check — must be before hasSuffix-based stack cases
+	case path == "/selfupdate/check" && req.Method == http.MethodPost:
+		r.selfupdateCheck(w, req)
+
+	// POST /api/selfupdate/update — must be before hasSuffix("/update") stack case
+	case path == "/selfupdate/update" && req.Method == http.MethodPost:
+		r.selfupdateTrigger(w, req)
+
 	// GET /api/stacks/{name}/deploy-fields
 	case hasSuffix(path, "/deploy-fields") && req.Method == http.MethodGet:
 		r.getDeployFields(w, req, extractName(path, "/deploy-fields"))
@@ -156,18 +168,6 @@ func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	case path == "/metrics/sysinfo" && req.Method == http.MethodGet:
 		r.metricsSysInfo(w, req)
 
-	// GET /api/selfupdate/status
-	case path == "/selfupdate/status" && req.Method == http.MethodGet:
-		r.selfupdateStatus(w, req)
-
-	// POST /api/selfupdate/check
-	case path == "/selfupdate/check" && req.Method == http.MethodPost:
-		r.selfupdateCheck(w, req)
-
-	// POST /api/selfupdate/update
-	case path == "/selfupdate/update" && req.Method == http.MethodPost:
-		r.selfupdateTrigger(w, req)
-
 	default:
 		writeJSON(w, http.StatusNotFound, apiResponse{OK: false, Error: "endpoint not found"})
 	}