fix(web): code review pass — scroll watch, SSE same-origin, store concurrency, modal reset, admin validation

web/src/api/llmAdmin.ts

@@ -1,4 +1,4 @@
-import { request } from './client'
+import { buildQuery, request } from './client'
 
 export type LLMProvider = 'anthropic' | 'openai' | 'gemini'
 
@@ -79,16 +79,6 @@ export interface AdminUsageItem {
 
 const enc = (v: string) => encodeURIComponent(v)
 
-function buildQuery(params: object): string {
-  const q = new URLSearchParams()
-  for (const [k, v] of Object.entries(params)) {
-    if (v === undefined || v === null || v === '') continue
-    q.set(k, String(v))
-  }
-  const s = q.toString()
-  return s ? '?' + s : ''
-}
-
 export const llmAdminApi = {
   // ===== Endpoints =====
   listEndpoints: () =>