feat: add DOCX export endpoint and button with watermark support

app/routes/plans.py

@@ -763,6 +763,126 @@ def export_md(plan_id):
     )
 
 
+@main_bp.route("/api/plans/<int:plan_id>/docx", methods=["GET"])
+@login_required_json
+def export_docx(plan_id):
+    """导出DOCX - 使用pandoc将markdown转为docx"""
+    import subprocess, tempfile, os, shutil
+    from urllib.parse import quote
+
+    plan = PracticePlan.query.get_or_404(plan_id)
+    content = json.loads(plan.content)
+    student_name = plan.student.name if plan.student else "未知学员"
+    template_id = request.args.get('template_id', type=int)
+
+    # 获取报告模板（复用export_md的逻辑）
+    report_template = None
+    try:
+        from app.models import Template
+        if template_id:
+            tmpl = Template.query.get(template_id)
+            if tmpl and tmpl.type == "report":
+                report_template = tmpl.content
+        else:
+            tmpl = Template.query.filter_by(type="report").order_by(Template.sort_order.asc()).first()
+            if tmpl:
+                report_template = tmpl.content
+    except:
+        pass
+
+    if report_template:
+        rendered = report_template
+        rendered = rendered.replace("{student_name}", student_name)
+        rendered = rendered.replace("{practice_time}", content.get('practice_time', 'N/A'))
+        rendered = rendered.replace("{total_minutes}", str(content.get('total_daily_minutes', 0)))
+        rendered = rendered.replace("{generated_at}", content.get('generated_at', ''))
+        from app.models import User
+        user_id = session.get('user_id')
+        user_name = '未知'
+        if user_id:
+            user = User.query.get(user_id)
+            if user and user.name:
+                user_name = user.name
+        rendered = rendered.replace("{generated_by}", user_name)
+        if content.get('ai_report'):
+            rendered = rendered.replace("{ai_report}", content['ai_report'])
+        else:
+            rendered = rendered.replace("{ai_report}", "（未生成AI报告）")
+        problem_tags = ""
+        for problem in content.get('problems', []):
+            problem_tags += f"- **{problem.get('name', '')}** ({problem.get('severity', '')})\n"
+        rendered = rendered.replace("{problem_tags}", problem_tags or "（无）")
+        # 学员目标
+        from app.models import StudentGoal
+        student_goals_list = StudentGoal.query.filter_by(student_id=plan.student_id).all() if plan.student_id else []
+        goals_text_parts = []
+        for g in student_goals_list:
+            if g.status != "已完成":
+                goals_text_parts.append(f"- **{g.goal.name}**\n  {g.goal.content if g.goal else '未提供具体内容'}")
+        goals_text = "\n".join(goals_text_parts) if goals_text_parts else "（无）"
+        rendered = rendered.replace("{student_goals}", goals_text)
+        md_content = rendered
+    else:
+        md_lines = [
+            f"# {student_name} - 个性化练习方案\n",
+            f"**练习时间**: {content.get('practice_time', 'N/A')} (共{content.get('total_daily_minutes', 0)}分钟)\n",
+            f"**生成时间**: {content.get('generated_at', '')}\n",
+            "\n---\n",
+        ]
+        if content.get('ai_report'):
+            md_lines.append(content['ai_report'])
+        md_content = ''.join(md_lines)
+
+    # 转换markdown为docx
+    tmp_dir = tempfile.mkdtemp()
+    md_path = os.path.join(tmp_dir, f"plan_{plan_id}.md")
+    docx_path = os.path.join(tmp_dir, f"{student_name}_练习方案.docx")
+
+    with open(md_path, "w", encoding="utf-8") as f:
+        f.write(md_content)
+
+    try:
+        subprocess.run(
+            ["pandoc", md_path, "-o", docx_path],
+            check=True, capture_output=True
+        )
+
+        # 添加水印
+        from app.config import load_api_config
+        api_config = load_api_config(current_app.config)
+        wm_text = api_config.get("watermark_text", "")
+        if wm_text:
+            from docx import Document
+            doc = Document(docx_path)
+            section = doc.sections[0]
+            header = section.header
+            # 清除现有header内容
+            for para in header.paragraphs:
+                for run in para.runs:
+                    run.text = ""
+            # 添加水印paragraph
+            header_para = header.paragraphs[0] if header.paragraphs else header.add_paragraph()
+            header_para.text = wm_text
+            header_para.alignment = 1  # CENTER (WD_ALIGN_PARAGRAPH.CENTER = 1)
+            for run in header_para.runs:
+                run.font.size = Pt(48)
+                run.font.color.rgb = RGBColor(180, 180, 180)
+                run.font.name = "Arial"
+            doc.save(docx_path)
+
+        with open(docx_path, "rb") as f:
+            docx_data = f.read()
+    finally:
+        shutil.rmtree(tmp_dir, ignore_errors=True)
+
+    filename = quote(f"{student_name}_练习方案.docx")
+    return Response(
+        docx_data,
+        mimetype='application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+        headers={'Content-Disposition': f"attachment; filename*=UTF-8''{filename}"}
+    )
+
+
 @main_bp.route("/plans/<int:plan_id>/wechat", methods=["GET"])
 @login_required_json
 def wechat_card(plan_id):