feat: add configurable watermark text in API settings

app/routes/plans.py

@@ -660,6 +660,7 @@ def export_pdf(plan_id):
         content=content,
         output_dir=current_app.config["PDF_OUTPUT_DIR"],
         rendered_report=rendered_report,  # 传递渲染后的报告
+        watermark_text=api_config.get("watermark_text"),
     )
 
     return send_file(

app/services/pdf_generator.py

@@ -192,7 +192,7 @@ class PianoPDF:
             self.elements.append(Spacer(1, 5*mm))
 
 
-def generate_pdf(plan_id, student_name, content, output_dir, rendered_report=None):
+def generate_pdf(plan_id, student_name, content, output_dir, rendered_report=None, watermark_text=None):
     """生成PDF文件"""
     os.makedirs(output_dir, exist_ok=True)
     output_path = os.path.join(output_dir, f"plan_{plan_id}.pdf")
@@ -272,7 +272,7 @@ def generate_pdf(plan_id, student_name, content, output_dir, rendered_report=Non
 
     # 水印函数（每页都绘制）
     def draw_watermark(c, doc):
-        if not CHINESE_FONT_OK:
+        if not watermark_text or not CHINESE_FONT_OK:
             return
         c.saveState()
         try:
@@ -283,7 +283,7 @@ def generate_pdf(plan_id, student_name, content, output_dir, rendered_report=Non
             c.translate(A4[0]/2, A4[1]/2)
             c.rotate(45)
             # 绘制水印文字（居中）
-            c.drawCentredString(0, 0, "仅供学习参考")
+            c.drawCentredString(0, 0, watermark_text)
         except Exception:
             pass  # 字体问题则跳过水印
         c.restoreState()

app/templates/api_settings.html

@@ -57,6 +57,12 @@
                 <small class="text-muted">控制输出的随机性，值越大越有创造性</small>
             </div>
 
+            <div class="mb-3">
+                <label class="form-label">PDF水印文本</label>
+                <input type="text" class="form-control" id="watermarkText" placeholder="留空则不显示水印">
+                <small class="text-muted">PDF每页中央显示的斜向水印文字</small>
+            </div>
+
             <div class="d-flex gap-2">
                 <button type="button" class="btn btn-primary" onclick="saveApiConfig()">
                     <i class="bi bi-save"></i> 保存配置
@@ -171,7 +177,8 @@ async function saveApiConfig(silent = false, overrideProvider = null) {
         model: document.getElementById('apiModel').value,
         api_key: document.getElementById('apiKey').value,
         base_url: document.getElementById('apiEndpoint').value,
-        temperature: parseFloat(document.getElementById('apiTemperature').value)
+        temperature: parseFloat(document.getElementById('apiTemperature').value),
+        watermark_text: document.getElementById('watermarkText').value.trim()
     };
 
     const r = await fetch('/api/config', {
@@ -199,6 +206,7 @@ async function loadApiConfig() {
         document.getElementById('apiKey').value = config.api_key || '';
         document.getElementById('apiEndpoint').value = config.base_url || '';
         document.getElementById('apiTemperature').value = config.temperature || 0.7;
+        document.getElementById('watermarkText').value = config.watermark_text || '';
 
         if (config.api_key_preview) {
             document.getElementById('apiKeyPreview').textContent = '当前: ' + config.api_key_preview;