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/schemas/node.ts

@@ -23,6 +23,11 @@ export const NodeRecordSchema = z.object({
   depletedCount: z.number().optional(),
   lastHeartbeat: z.number().optional(),
   lastError: z.string().optional(),
+  // Xray state captured from the remote node's own /panel/api/server/status.
+  // Lets the nodes list show a distinct indicator when the panel API is reachable
+  // (status=online) but the Xray core on that node has failed.
+  xrayState: z.string().optional(),
+  xrayError: z.string().optional(),
   allowPrivateAddress: z.boolean().optional(),
   tlsVerifyMode: z.enum(['verify', 'skip', 'pin']).optional(),
   pinnedCertSha256: z.string().optional(),
@@ -40,6 +45,9 @@ export const ProbeResultSchema = z.object({
   latencyMs: z.number().optional(),
   xrayVersion: z.string().optional(),
   error: z.string().optional(),
+  // Present on successful probe; used to surface "connected to panel, but xray failed on node".
+  xrayState: z.string().optional(),
+  xrayError: z.string().optional(),
 }).loose();
 
 export const NodeFormSchema = z.object({