Add configurable add-on options system with Prisma ORM

[timoconnellaus]

Summary

This PR implements a comprehensive add-on options system that allows add-ons to define configurable options for users during app creation.

What This Enables

• Database provider selection - Choose between PostgreSQL, MySQL, or SQLite for Prisma ORM
• Interactive UI configuration - Configure add-on options through a clean dialog interface
• Framework-specific configurations - Tailor add-ons to different setups and preferences
• Dynamic dependencies - Install only the packages needed for chosen options
• Automated workflows - Configure add-ons non-interactively via JSON

Template Configuration Examples

Add-on definition with options:

{
  "name": "Prisma ORM",
  "options": {
    "database": {
      "type": "select",
      "label": "Database Provider",
      "default": "postgres",
      "options": [
        { "value": "postgres", "label": "PostgreSQL" },
        { "value": "mysql", "label": "MySQL" },
        { "value": "sqlite", "label": "SQLite" }
      ]
    }
  }
}

Conditional file generation based on options:

<\!-- __postgres__schema.prisma.ejs -->
<% if (addOnOption.prisma.database \!== 'postgres') { ignoreFile() } %>
generator client {
  provider = "prisma-client-js"
}

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

model User {
  id        Int      @id @default(autoincrement())
  email     String   @unique
  name      String?
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
}

Dynamic package dependencies:

{
  "dependencies": {
    "prisma": "^5.8.0",
    "@prisma/client": "^5.8.0",
    <% if (addOnOption.prisma.database === 'postgres') { %>
    "pg": "^8.11.0",
    <% } %>
    <% if (addOnOption.prisma.database === 'mysql') { %>
    "mysql2": "^3.6.0",
    <% } %>
  },
  "devDependencies": {
    <% if (addOnOption.prisma.database === 'postgres') { %>
    "@types/pg": "^8.10.0"
    <% } %>
    <% if (addOnOption.prisma.database === 'mysql') { %>
    "@types/mysql2": "^3.6.0"
    <% } %>
    <% if (addOnOption.prisma.database === 'sqlite') { %>
    "@types/better-sqlite3": "^7.6.0"
    <% } %>
  }
}

Key Features Implemented

• Configurable add-on options with Zod schema validation
• EJS template integration with addOnOption context variable
• Conditional file generation using __prefix__ filename patterns
• Dynamic package dependencies via package.json.ejs templates
• Complete CLI integration with discovery and configuration features
• Interactive UI with dialog-based configuration system
• Non-interactive automation support via JSON configuration

CLI Usage Examples

# Discovery workflow
node cli/create-tsrouter-app/dist/index.js --list-add-ons
node cli/create-tsrouter-app/dist/index.js --addon-details prisma

# Interactive configuration
node cli/create-tsrouter-app/dist/index.js my-app --add-ons prisma

# Non-interactive automation
node cli/create-tsrouter-app/dist/index.js my-app --add-ons prisma --add-on-config '"'"'{"prisma":{"database":"mysql"}}'"'"'

Test plan

• Add-on options schema validation works correctly
• Conditional file generation based on database selection
• Dynamic package dependencies installation
• CLI discovery and configuration workflows
• Interactive UI configuration dialog
• Non-interactive automation via JSON config
• Prisma ORM integration with PostgreSQL, MySQL, and SQLite
• TanStack Router integration with proper route structure
• Server functions integration with TanStack Start