支持局域网 GPU OCR 服务，配置方式类似 Ollama。

frontend/src/api/client.ts

@@ -78,6 +78,7 @@ export const adminApi = {
     openai_base_url?: string | null
     openai_model?: string | null
     openai_api_key?: string
+    ocr_service_url?: string | null
   }) => api.patch<SystemSettings>('/admin/settings', data),
   updateProfile: (data: {
     username?: string

frontend/src/pages/SettingsPage.tsx

@@ -52,6 +52,7 @@ export default function SettingsPage() {
         openai_base_url: settingsRes.data.openai_base_url || '',
         openai_model: settingsRes.data.openai_model || '',
         openai_api_key: '',
+        ocr_service_url: settingsRes.data.ocr_service_url || '',
       })
     } finally {
       setLoading(false)
@@ -115,6 +116,7 @@ export default function SettingsPage() {
     openai_base_url?: string
     openai_model?: string
     openai_api_key?: string
+    ocr_service_url?: string
   }) => {
     const payload: Parameters<typeof adminApi.updateSettings>[0] = {
       ai_provider: values.ai_provider,
@@ -122,6 +124,7 @@ export default function SettingsPage() {
       ollama_model: values.ollama_model || null,
       openai_base_url: values.openai_base_url || null,
       openai_model: values.openai_model || null,
+      ocr_service_url: values.ocr_service_url?.trim() || null,
     }
     if (values.openai_api_key?.trim()) {
       payload.openai_api_key = values.openai_api_key.trim()
@@ -234,6 +237,13 @@ export default function SettingsPage() {
                         </Form.Item>
                       </>
                     )}
+                    <Form.Item
+                      name="ocr_service_url"
+                      label="OCR 服务地址（局域网 GPU 机器）"
+                      extra="留空则在应用服务器本机 CPU 识别。填写后类似 Ollama，例如 http://192.168.8.100:23567"
+                    >
+                      <Input placeholder="http://192.168.8.100:23567" />
+                    </Form.Item>
                     <Typography.Paragraph type="secondary">
                       错题/奥数解法将按学生学段（初中/高中）生成，并严格禁止超纲解题。
                     </Typography.Paragraph>

frontend/src/types/index.ts

@@ -23,6 +23,7 @@ export interface SystemSettings {
   openai_base_url: string | null
   openai_model: string | null
   openai_api_key_set: boolean
+  ocr_service_url: string | null
   updated_at: string
 }