feat: Add Prisma schema import support (Beta)

[QUBITABHAY]

Overview

Adds support for importing Prisma ORM schema files into DrawDB with automatic SQL export to the detected database provider.

Changes

• Added Prisma schema import option in File > Import from menu (marked as Beta)
• Implemented fromPrisma() parser in src/utils/importFrom/prisma.js
• Parse model blocks → tables with fields
• Parse enum blocks → enums
• Parse @relation() → relationships with cardinality inference
• Parse field attributes: @id, @@id([...]), @unique, @default(), autoincrement()
• Detect datasource provider and auto-set diagram database
• Auto-arrange imported tables on canvas
• Reject the MongoDB provider with a clear error message

Supported Prisma Features

Models & Fields

• Model declarations → tables
• Field types, nullability (?), lists ([])
• Primary keys: @id and composite @@id([field1, field2])
• Unique constraints: @unique
• Default values: @default(value) including autoincrement()

Relationships

• @relation(fields: [...], references: [...])
• Cardinality inference (one-to-many for list types, many-to-one otherwise)
• Named relations via name: \"relationName\"

Enums

• Full enum support

Datasource Detection

Automatically detects and maps the provider to the diagram database:

• `postgresql` / `postgres` → PostgreSQL
• `mysql` → MySQL
• `mariadb` → MariaDB
• `sqlite` → SQLite
• `sqlserver` → SQL Server
• `cockroachdb` → PostgreSQL
• `mongodb` → rejected (not SQL)

Usage

1. Open DrawDB editor
2. File → Import from → Prisma schema (Beta)
3. Upload your `.prisma` file
4. Tables, relationships, and enums are imported
5. Export to SQL using the detected database provider

Limitations (Beta)

• Does not parse composite types or views
• Limited support for advanced Prisma features (e.g., named indexes from @@unique([...]), @@index)
• Does not parse @map / @@map for custom column/table names
• No onDelete / onUpdate cascade parsing yet

Testing

• ESLint passes on all changed files
• Import flow integrated with the existing modal system
• Error handling for malformed schemas
• Database provider detection is working

Files Changed

• `src/data/constants.js` — Added IMPORT_FROM.PRISMA
• `src/components/EditorHeader/ControlPanel.jsx` — Added menu option
• `src/components/EditorHeader/Modal/ImportDiagram.jsx` — Prisma file handling
• `src/components/EditorHeader/Modal/Modal.jsx` — Database auto-setting
• `src/utils/importFrom/prisma.js` — New parser implementation

Closes issue #681

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[QUBITABHAY]

@1ilit, please review it