bulk import - users and organizations

[edospadoni]

Overview

Implement Bulk Import feature for users and organizations (distributors, resellers, customers) via CSV file upload with validation, preview, and confirmation workflow.

Requirements

Core Features

• CSV template download per entity type
• CSV file upload and server-side validation
• Row-by-row validation report (errors, warnings, valid rows)
• Import confirmation step with validated import_id
• Bulk creation of entities with proper hierarchy assignment

Entity Types

• Users — bulk create with organization assignment, roles
• Distributors — bulk create (Owner only)
• Resellers — bulk create with distributor assignment
• Customers — bulk create with reseller assignment

Backend APIs Available

All necessary REST APIs are implemented:

• GET /api/{entity}/import/template - Download CSV import template
• POST /api/{entity}/import/validate - Validate CSV file, returns row-by-row report + import_id
• POST /api/{entity}/import/confirm - Execute validated import using import_id
• GET /api/users/import/template - Download CSV import template for users
• POST /api/users/import/validate - Validate CSV file for bulk user import
• POST /api/users/import/confirm - Execute validated user import

Frontend

• Import wizard component (upload → validate → review → confirm)
• Validation results table with per-row status
• Error/warning display with actionable messages
• Success/failure summary after import execution

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Design mockup: #69