feat: fold traefik into the service widget type, remove the dedicated one

Traefik gets the same treatment as the other six services now instead
of a bespoke widget type: docker health merged with a single "Routes"
stat, via the same internal container-to-container API call
(http://traefik:8080/api/http/routers) it already used. No auth
needed, same as before.

Deleted lib/collectors/traefik.ts, lib/types/traefik-result.ts, and
components/widgets/traefik/ entirely - the generic service Widget.tsx
and ServiceWidgetResult shape cover it with zero new component code.

lib/collectors/scheduler.ts

@@ -5,7 +5,6 @@ import { parseDuration } from "@/lib/config/duration";
 import { collectDockerContainer, dockerLimit } from "./docker";
 import { collectSystem } from "./system";
 import { collectHttp } from "./http";
-import { collectTraefik } from "./traefik";
 import { collectService } from "./service";
 import type { WidgetResult } from "@/lib/types/widget-result";
 
@@ -20,14 +19,7 @@ interface Job {
   consecutiveFailures: number;
 }
 
-const COLLECTOR_TYPES = new Set<Widget["type"]>([
-  "docker",
-  "database",
-  "system",
-  "http",
-  "traefik",
-  "service",
-]);
+const COLLECTOR_TYPES = new Set<Widget["type"]>(["docker", "database", "system", "http", "service"]);
 
 function isCollectorWidget(widget: Widget): boolean {
   return COLLECTOR_TYPES.has(widget.type);
@@ -39,7 +31,6 @@ function getIntervalMs(widget: Widget): number {
     widget.type === "database" ||
     widget.type === "system" ||
     widget.type === "http" ||
-    widget.type === "traefik" ||
     widget.type === "service"
   ) {
     return parseDuration(widget.interval);
@@ -60,9 +51,6 @@ function sameTarget(a: Widget, b: Widget): boolean {
   if (a.type === "http" && b.type === "http") {
     return a.url === b.url && a.method === b.method && a.expect.status === b.expect.status;
   }
-  if (a.type === "traefik" && b.type === "traefik") {
-    return a.apiUrl === b.apiUrl;
-  }
   if (a.type === "service" && b.type === "service") {
     return a.containerName === b.containerName && a.service === b.service && a.showStats === b.showStats;
   }
@@ -88,10 +76,6 @@ async function collect(widget: Widget): Promise<WidgetResult> {
     );
     return { type: "http", data: { ...data, consecutiveFailures: 0 } };
   }
-  if (widget.type === "traefik") {
-    const data = await collectTraefik(widget.apiUrl);
-    return { type: "traefik", data };
-  }
   if (widget.type === "service") {
     const data = await collectService(widget);
     return { type: "service", data };