fix(frontend): upstream account edit fields and mixed_scheduling on create

- EditAccountModal: add Base URL / API Key fields for upstream type
- EditAccountModal: initialize editBaseUrl from credentials on upstream account open
- EditAccountModal: save upstream credentials (base_url, api_key) on submit
- CreateAccountModal: pass mixed_scheduling extra when creating upstream account

frontend/src/components/account/CreateAccountModal.vue

@@ -2714,7 +2714,8 @@ const handleSubmit = async () => {
 
     submitting.value = true
     try {
-      await createAccountAndFinish(form.platform, 'upstream', credentials)
+      const extra = mixedScheduling.value ? { mixed_scheduling: true } : undefined
+      await createAccountAndFinish(form.platform, 'upstream', credentials, extra)
     } catch (error: any) {
       appStore.showError(error.response?.data?.detail || t('admin.accounts.failedToCreate'))
     } finally {

frontend/src/components/account/EditAccountModal.vue

@@ -364,6 +364,30 @@
         </div>
       </div>
 
+      <!-- Upstream fields (only for upstream type) -->
+      <div v-if="account.type === 'upstream'" class="space-y-4">
+        <div>
+          <label class="input-label">{{ t('admin.accounts.upstream.baseUrl') }}</label>
+          <input
+            v-model="editBaseUrl"
+            type="text"
+            class="input"
+            placeholder="https://s.konstants.xyz"
+          />
+          <p class="input-hint">{{ t('admin.accounts.upstream.baseUrlHint') }}</p>
+        </div>
+        <div>
+          <label class="input-label">{{ t('admin.accounts.upstream.apiKey') }}</label>
+          <input
+            v-model="editApiKey"
+            type="password"
+            class="input font-mono"
+            placeholder="sk-..."
+          />
+          <p class="input-hint">{{ t('admin.accounts.leaveEmptyToKeep') }}</p>
+        </div>
+      </div>
+
       <!-- Antigravity model restriction (applies to all antigravity types) -->
       <!-- Antigravity 只支持模型映射模式，不支持白名单模式 -->
       <div v-if="account.platform === 'antigravity'" class="border-t border-gray-200 pt-4 dark:border-dark-600">
@@ -1244,6 +1268,9 @@ watch(
         } else {
           selectedErrorCodes.value = []
         }
+      } else if (newAccount.type === 'upstream' && newAccount.credentials) {
+        const credentials = newAccount.credentials as Record<string, unknown>
+        editBaseUrl.value = (credentials.base_url as string) || ''
       } else {
         const platformDefaultUrl =
           newAccount.platform === 'openai'
@@ -1584,6 +1611,22 @@ const handleSubmit = async () => {
         return
       }
 
+      updatePayload.credentials = newCredentials
+    } else if (props.account.type === 'upstream') {
+      const currentCredentials = (props.account.credentials as Record<string, unknown>) || {}
+      const newCredentials: Record<string, unknown> = { ...currentCredentials }
+
+      newCredentials.base_url = editBaseUrl.value.trim()
+
+      if (editApiKey.value.trim()) {
+        newCredentials.api_key = editApiKey.value.trim()
+      }
+
+      if (!applyTempUnschedConfig(newCredentials)) {
+        submitting.value = false
+        return
+      }
+
       updatePayload.credentials = newCredentials
     } else {
       // For oauth/setup-token types, only update intercept_warmup_requests if changed