feat(fns): парсер ФНС бухгалтерской отчетности

- Модели FinancialReport и FinancialReportLine
- FNSExcelParser для файлов fin_{id}_{ogrn}.xlsx
- FNSReportService с дедупликацией по хешу файла
- Celery задачи для мониторинга папки (каждые 5 мин)
- API: POST /fns/upload/, GET /fns/reports/
- Django admin интеграция
- 25 unit-тестов

src/config/celery.py

@@ -34,6 +34,11 @@ app.conf.beat_schedule = {
         "task": "apps.parsers.tasks.parse_manufactures",
         "schedule": 86400.0,  # Every 24 hours
     },
+    # Сканирование папки FNS - каждые 5 минут
+    "scan-fns-directory": {
+        "task": "apps.parsers.tasks.scan_fns_directory",
+        "schedule": 300.0,  # Every 5 minutes
+    },
 }
 
 app.conf.timezone = "Europe/Moscow"

src/config/settings/base.py

@@ -383,3 +383,16 @@ LOGGING = {
         },
     },
 }
+
+# =============================================================================
+# FNS Parser Settings
+# =============================================================================
+
+# Directory for watching incoming FNS files
+FNS_WATCH_DIRECTORY = BASE_DIR / "input" / "fns"
+
+# Directory for processed files (moved after successful processing)
+FNS_PROCESSED_DIRECTORY = BASE_DIR / "input" / "fns" / "processed"
+
+# Directory for failed files (moved after failed processing)
+FNS_FAILED_DIRECTORY = BASE_DIR / "input" / "fns" / "failed"