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/config/schema.ts

@@ -58,15 +58,6 @@ export const httpWidgetSchema = z.object({
     .default({ status: 200 }),
 });
 
-export const traefikWidgetSchema = z.object({
-  type: z.literal("traefik"),
-  name: z.string().default("Traefik"),
-  apiUrl: z.string().url(),
-  href: z.string().url().optional(),
-  icon: z.string().optional(),
-  interval: durationSchema.default("15s"),
-});
-
 const serviceCommonFields = {
   type: z.literal("service") as z.ZodLiteral<"service">,
   name: z.string(),
@@ -116,6 +107,11 @@ export const headscaleServiceWidgetSchema = z.object({
   apiToken: z.string(),
 });
 
+export const traefikServiceWidgetSchema = z.object({
+  ...serviceCommonFields,
+  service: z.literal("traefik"),
+});
+
 export const serviceWidgetSchema = z.discriminatedUnion("service", [
   giteaServiceWidgetSchema,
   coolifyServiceWidgetSchema,
@@ -123,6 +119,7 @@ export const serviceWidgetSchema = z.discriminatedUnion("service", [
   n8nServiceWidgetSchema,
   umamiServiceWidgetSchema,
   headscaleServiceWidgetSchema,
+  traefikServiceWidgetSchema,
 ]);
 
 export const widgetSchema = z.discriminatedUnion("type", [
@@ -132,7 +129,6 @@ export const widgetSchema = z.discriminatedUnion("type", [
   databaseWidgetSchema,
   systemWidgetSchema,
   httpWidgetSchema,
-  traefikWidgetSchema,
   serviceWidgetSchema,
 ]);
 
@@ -194,3 +190,4 @@ export type ImmichServiceWidget = z.infer<typeof immichServiceWidgetSchema>;
 export type N8nServiceWidget = z.infer<typeof n8nServiceWidgetSchema>;
 export type UmamiServiceWidget = z.infer<typeof umamiServiceWidgetSchema>;
 export type HeadscaleServiceWidget = z.infer<typeof headscaleServiceWidgetSchema>;
+export type TraefikServiceWidget = z.infer<typeof traefikServiceWidgetSchema>;