docs(api): document POST /panel/api/inbounds/:id/delAllClients

Adds the OpenAPI entry for the new "delete all clients of an inbound"
endpoint and regenerates openapi.json (116 paths, 117 operations).

frontend/src/pages/api-docs/endpoints.ts

@@ -174,6 +174,15 @@ export const sections: readonly Section[] = [
           { name: 'id', in: 'path', type: 'number', desc: 'Inbound ID.' },
         ],
       },
+      {
+        method: 'POST',
+        path: '/panel/api/inbounds/:id/delAllClients',
+        summary: 'Remove every client attached to a single inbound while keeping the inbound itself. Collects emails from settings.clients[] and feeds them into the optimized bulk-delete path (runtime user removal + traffic-row cleanup + SyncInbound). Destructive and cannot be undone.',
+        params: [
+          { name: 'id', in: 'path', type: 'number', desc: 'Inbound ID.' },
+        ],
+        response: '{\n  "success": true,\n  "obj": {\n    "deleted": 12\n  }\n}',
+      },
       {
         method: 'POST',
         path: '/panel/api/inbounds/resetAllTraffics',