refactor: Update health check service to use undici's fetch for improved HTTP probing and enhance FormFieldSimple component with optional hint prop

apps/web/src/components/form-field.tsx

@@ -63,6 +63,7 @@ interface FormFieldSimpleProps {
   label: string
   htmlFor: string
   error?: { message?: string }
+  hint?: string
   className?: string
   children: ReactNode
 }
@@ -71,6 +72,7 @@ export function FormFieldSimple({
   label,
   htmlFor,
   error,
+  hint,
   className,
   children,
 }: FormFieldSimpleProps) {
@@ -78,6 +80,9 @@ export function FormFieldSimple({
     <Field data-invalid={!!error} className={cn(className)}>
       <FieldLabel htmlFor={htmlFor}>{label}</FieldLabel>
       {children}
+      {hint && !error && (
+        <p className="text-xs text-muted-foreground">{hint}</p>
+      )}
       <FieldError errors={[error]} />
     </Field>
   )

apps/web/src/components/health-check-config-fields.tsx

@@ -141,10 +141,11 @@ export function HealthCheckConfigFields({
               <FormFieldSimple
                 label="HTTP path"
                 htmlFor={`${idPrefix}-path`}
+                hint="Опционально. По умолчанию проверяется /"
               >
                 <AppInput
                   id={`${idPrefix}-path`}
-                  placeholder="/health"
+                  placeholder="/"
                   value={value.path ?? ''}
                   onChange={(e) =>
                     patch({ path: e.target.value === '' ? null : e.target.value })