feat(sub): per-inbound sort order for subscription links

Add a subSortIndex field to inbounds that controls the order of links
in subscription output only: the raw sub body, the HTML sub page, and
the JSON/Clash formats (all served from the same query). Lower values
come first; ties keep id order. The panel inbound list is unaffected.

The value is editable in the inbound form next to the share-address
fields, propagates to nodes via wireInbound, and follows the usual
node-sync rules (copied on import, mirrored while not dirty, never a
structural change).

Rescoped from #5214 by @Ponywka.

frontend/src/generated/examples.ts

@@ -292,6 +292,7 @@ export const EXAMPLES: Record<string, unknown> = {
     "shareAddrStrategy": "node",
     "sniffing": null,
     "streamSettings": null,
+    "subSortIndex": 1,
     "tag": "in-443-tcp",
     "total": 0,
     "trafficReset": "never",

frontend/src/generated/schemas.ts

@@ -1319,6 +1319,12 @@ export const SCHEMAS: Record<string, unknown> = {
       },
       "sniffing": {},
       "streamSettings": {},
+      "subSortIndex": {
+        "description": "1-based sort order of this inbound's links in subscription output only (lower first; ties by id)",
+        "example": 1,
+        "minimum": 1,
+        "type": "integer"
+      },
       "tag": {
         "example": "in-443-tcp",
         "type": "string"
@@ -1359,6 +1365,7 @@ export const SCHEMAS: Record<string, unknown> = {
       "shareAddrStrategy",
       "sniffing",
       "streamSettings",
+      "subSortIndex",
       "tag",
       "total",
       "trafficReset",

frontend/src/generated/types.ts

@@ -293,6 +293,7 @@ export interface Inbound {
   shareAddrStrategy: string;
   sniffing: unknown;
   streamSettings: unknown;
+  subSortIndex: number;
   tag: string;
   total: number;
   trafficReset: string;

frontend/src/generated/zod.ts

@@ -314,6 +314,7 @@ export const InboundSchema = z.object({
   shareAddrStrategy: z.enum(['node', 'listen', 'custom']),
   sniffing: z.unknown(),
   streamSettings: z.unknown(),
+  subSortIndex: z.number().int().min(1),
   tag: z.string(),
   total: z.number().int(),
   trafficReset: z.enum(['never', 'hourly', 'daily', 'weekly', 'monthly']),