fix(inbounds): allow negative subSortIndex for subscription order (#6465)

* fix(inbounds): allow negative subSortIndex for subscription order

Preserve explicitly set negative indices so primary inbounds can sort
ahead of the default without renumbering peers; keep 0/omitted → 1.

* fix(inbounds): gofumpt model.go and trim subSortIndex comments

---------

Co-authored-by: mrchatam <287639636+mrchatam@users.noreply.github.com>

frontend/src/generated/schemas.ts

@@ -2604,9 +2604,8 @@ 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)",
+        "description": "Sort order of this inbound's links in subscription output only (lower first; negatives allowed; 0/omitted → 1; ties by id)",
         "example": 1,
-        "minimum": 1,
         "type": "integer"
       },
       "tag": {

frontend/src/generated/zod.ts

@@ -638,7 +638,7 @@ export const InboundSchema = z.object({
   shareAddrStrategy: z.enum(['node', 'listen', 'custom']),
   sniffing: z.unknown(),
   streamSettings: z.unknown(),
-  subSortIndex: z.number().int().min(1),
+  subSortIndex: z.number().int(),
   tag: z.string(),
   total: z.number().int(),
   trafficReset: z.enum(['never', 'hourly', 'daily', 'weekly', 'monthly']),