feat(nodes): add distinct purple indicator when panel is online but Xray core failed (#5040)

* feat(nodes): add distinct purple indicator when panel is online but Xray core failed

Currently nodes only show binary online/offline based on panel API reachability.

This adds a third state:
- Green: panel reachable + Xray healthy
- Purple pulsing dot + "Online (Xray Error)": panel API works (management actions still available) but the node Xray process is in error or stopped. Tooltip shows the remote xrayError.
- Red: unreachable (unchanged)

Backend now captures xray.state + xray.errorMsg from /panel/api/server/status heartbeats and probes.
New fields on Node + NodeSummary, forwarded for transitive nodes.
Frontend Zod + NodeList rendering + dedicated .xray-error-dot CSS (color #722ED1) + i18n key.

Color chosen purple per feedback after initial implementation.

Refs: worktree xray-failed-in-nodes

* fix: remove invalid JSON comment causing CI failures

* chore: regenerate OpenAPI schemas and types for xray error indicators

* chore: regenerate examples and schemas for xray error indicators

* chore: regenerate missing openapi.json examples

* fix

---------

Co-authored-by: Rqzbeh <rqzbeh@users.noreply.github.com>
Co-authored-by: Sanaei <ho3ein.sanaei@gmail.com>

frontend/src/generated/zod.ts

@@ -398,6 +398,8 @@ export const NodeSchema = z.object({
   transitive: z.boolean().optional(),
   updatedAt: z.number().int(),
   uptimeSecs: z.number().int(),
+  xrayError: z.string(),
+  xrayState: z.string(),
   xrayVersion: z.string(),
 });
 export type Node = z.infer<typeof NodeSchema>;
@@ -419,6 +421,8 @@ export const ProbeResultUISchema = z.object({
   panelVersion: z.string(),
   status: z.string(),
   uptimeSecs: z.number().int(),
+  xrayError: z.string(),
+  xrayState: z.string(),
   xrayVersion: z.string(),
 });
 export type ProbeResultUI = z.infer<typeof ProbeResultUISchema>;