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

web/src/api/chat.ts

@@ -1,4 +1,4 @@
-import { request } from './client'
+import { buildQuery, request } from './client'
 
 export type MessageRole = 'user' | 'assistant'
 export type MessageStatus = 'pending' | 'ok' | 'error' | 'cancelled'
@@ -95,16 +95,6 @@ export interface UsageDailyItem {
 
 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 chatApi = {
   // ===== Conversations =====
   listConversations: (params: ListConversationsParams = {}) =>

web/src/api/client.ts

@@ -75,3 +75,15 @@ export async function request<T>(path: string, opts: RequestOptions = {}): Promi
     clearTimeout(timer)
   }
 }
+
+// buildQuery 把任意对象拼成 "?k=v&..." 形式；undefined / null / '' 跳过；
+// 数组与对象用 String() 退化（业务侧目前没有数组 query 需求）。
+export 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 : ''
+}

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: () =>