fix(number-fields): избегаем потери точности длинных чисел

- number-поля теперь рендерятся как text + inputMode=numeric,
  чтобы браузер не округлял значения через input type=number
- пробелы при вставке в number-поля удаляются
- бэкенд нормализует значения number-полей в строку перед сохранением
- добавлен хелпер normalizeFieldValueForStorage

Closes: искажение расчётного счёта и других длинных числовых полей

README.md

@@ -0,0 +1,89 @@
+# iistwin
+
+[![CI](https://github.com/iisultanov/iistwin/actions/workflows/ci.yml/badge.svg)](https://github.com/iisultanov/iistwin/actions/workflows/ci.yml)
+![Node.js](https://img.shields.io/badge/node-%3E%3D20-brightgreen?logo=node.js&logoColor=white)
+![License](https://img.shields.io/badge/license-MIT-blue)
+![PostgreSQL](https://img.shields.io/badge/postgres-%3E%3D15-336791?logo=postgresql&logoColor=white)
+![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen)
+
+A multitenant corporate iistwin platform with a React frontend and an Express backend. It provides organizations with independent management of users, projects, and tasks on shared infrastructure, featuring data isolation, real-time communication, and customizable workflow automation.
+
+## Quickstart
+
+```bash
+cp .env.example .env   # fill in DATABASE_URL, JWT_SECRET, SESSION_SECRET
+npm install && npm run db:push && npm run dev
+```
+
+The app will be available at `http://localhost:5000`.
+
+## Key Features
+
+- Custom forms with configurable statuses, transitions, and conditional approvals
+- Hierarchical subtasks with unlimited nesting
+- Real-time chat with `@mentions` and Server-Sent Events
+- Inline-editable data tables with Excel import/export
+- JavaScript-powered custom tabs and layout components
+- Event-driven notification system (in-app, email, push)
+- Multi-tenant billing management
+- Progressive Web App (PWA) support
+
+## Getting Started
+
+### Prerequisites
+
+- Node.js 20+
+- PostgreSQL 15+ (or use the built-in Docker Postgres profile — see below)
+
+### Local development (without Docker)
+
+1. Copy the environment template and fill in the required values:
+
+   ```bash
+   cp .env.example .env
+   ```
+
+2. Install dependencies:
+
+   ```bash
+   npm install
+   ```
+
+3. Push the database schema:
+
+   ```bash
+   npm run db:push
+   ```
+
+4. Start the development server:
+
+   ```bash
+   npm run dev
+   ```
+
+   The app will be available at `http://localhost:5000`.
+
+## Running with Docker
+
+For Docker-based setup (including a built-in managed Postgres option), see **[DOCKER.md](./DOCKER.md)**.
+
+It covers:
+
+- **Mode 1** — connecting to an external database (e.g. Neon Cloud)
+- **Mode 2** — letting Docker spin up a local Postgres 16 container alongside the app
+
+## Environment Variables
+
+See `.env.example` for all required environment variables. At minimum you will need:
+
+| Variable | Description |
+|---|---|
+| `DATABASE_URL` | PostgreSQL connection string |
+| `JWT_SECRET` | Secret used to sign access tokens |
+| `SESSION_SECRET` | Secret used for session cookies |
+| `VAPID_PUBLIC_KEY` | Web Push VAPID public key |
+| `VAPID_PRIVATE_KEY` | Web Push VAPID private key |
+
+## Super Admin
+
+A system-level super admin panel is available at `/superadmin`. The first super admin account can be created via `POST /api/superadmin/seed` (optionally protected by the `SUPERADMIN_SEED_TOKEN` environment variable).