feat: Excel template export with meeting number auto-generation

- Add meeting_number field (M-YYYYMMDD-XX format) with auto-generation
- Refactor Excel export to use cell coordinates instead of placeholders
- Export files saved to backend/record/ directory with meeting number filename
- Add database migration for meeting_number column
- Add start.sh script for managing frontend/backend/sidecar services
- Update OpenSpec documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/tests/test_excel_export.py

@@ -0,0 +1,119 @@
+"""Test Excel export functionality with template filling."""
+import os
+import sys
+from datetime import datetime, date
+from openpyxl import load_workbook
+
+# Add parent directory to path
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from app.routers.export import fill_template_workbook, create_default_workbook, TEMPLATE_DIR, RECORD_DIR
+
+
+def test_excel_export():
+    """Test Excel generation with mock data."""
+
+    # Mock meeting data
+    meeting = {
+        "meeting_id": 1,
+        "uuid": "test-uuid-123",
+        "meeting_number": "M-20251211-01",
+        "subject": "專案進度討論會議",
+        "meeting_time": datetime(2025, 12, 11, 14, 30),
+        "location": "會議室A",
+        "chairperson": "王經理",
+        "recorder": "李小明",
+        "attendees": "張三, 李四, 王五",
+        "created_by": "test@example.com",
+    }
+
+    # Mock conclusions
+    conclusions = [
+        {"conclusion_id": 1, "content": "確認專案時程延後兩週", "system_code": "C-20251211-01"},
+        {"conclusion_id": 2, "content": "同意增加測試人力", "system_code": "C-20251211-02"},
+        {"conclusion_id": 3, "content": "下次會議改為線上進行", "system_code": "C-20251211-03"},
+    ]
+
+    # Mock action items
+    actions = [
+        {
+            "action_id": 1,
+            "content": "更新專案時程表",
+            "owner": "張三",
+            "due_date": date(2025, 12, 15),
+            "status": "Open",
+            "system_code": "A-20251211-01",
+        },
+        {
+            "action_id": 2,
+            "content": "聯繫人資部門增聘測試人員",
+            "owner": "李四",
+            "due_date": date(2025, 12, 20),
+            "status": "In Progress",
+            "system_code": "A-20251211-02",
+        },
+        {
+            "action_id": 3,
+            "content": "準備線上會議設備",
+            "owner": "王五",
+            "due_date": None,
+            "status": "Open",
+            "system_code": "A-20251211-03",
+        },
+    ]
+
+    # Check paths
+    template_path = os.path.join(TEMPLATE_DIR, "meeting_template.xlsx")
+    print(f"Template directory: {TEMPLATE_DIR}")
+    print(f"Record directory: {RECORD_DIR}")
+    print(f"Template exists: {os.path.exists(template_path)}")
+
+    # Ensure record directory exists
+    os.makedirs(RECORD_DIR, exist_ok=True)
+
+    # Generate filename with meeting number
+    meeting_number = meeting.get("meeting_number", "")
+    filename = f"{meeting_number}.xlsx" if meeting_number else f"meeting_{meeting['uuid']}.xlsx"
+    output_path = os.path.join(RECORD_DIR, filename)
+
+    # Test with template if exists
+    if os.path.exists(template_path):
+        print("\n=== Testing with template ===")
+        wb = load_workbook(template_path)
+        wb = fill_template_workbook(wb, meeting, conclusions, actions)
+        wb.save(output_path)
+        print(f"Saved to: {output_path}")
+
+        # Verify cell values
+        ws = wb.active
+        print("\n--- Verification ---")
+        print(f"D3 (Subject): {ws['D3'].value}")
+        print(f"D4 (Time): {ws['D4'].value}")
+        print(f"D5 (Chair): {ws['D5'].value}")
+        print(f"F4 (Location): {ws['F4'].value}")
+        print(f"F5 (Recorder): {ws['F5'].value}")
+        print(f"D6 (Attendees): {ws['D6'].value}")
+        print(f"C8 (Meeting Number): {ws['C8'].value}")
+        print(f"D8 (Conclusions): {ws['D8'].value}")
+        print(f"\nAction Items:")
+        for i in range(3):
+            row = 10 + i
+            print(f"  Row {row}: C={ws[f'C{row}'].value}, D={ws[f'D{row}'].value}, F={ws[f'F{row}'].value}, G={ws[f'G{row}'].value}, H={ws[f'H{row}'].value}")
+    else:
+        print("\n=== Template not found, using default generation ===")
+        wb = create_default_workbook(meeting, conclusions, actions)
+        wb.save(output_path)
+        print(f"Saved to: {output_path}")
+
+    print(f"\n✅ Test completed! File saved to: {output_path}")
+
+    # List files in record directory
+    print(f"\n--- Files in record directory ---")
+    for f in os.listdir(RECORD_DIR):
+        print(f"  {f}")
+
+    return True
+
+
+if __name__ == "__main__":
+    test_excel_export()