Quickstart nodejs

[bradleyshep]

Based on #4097

Description of Changes

Adds a Node.js quickstart template and documentation for SpacetimeDB.

Template (templates/nodejs-ts/)

• SpacetimeDB module with TypeScript (spacetimedb/src/index.ts)
• Node.js client with interactive CLI (src/main.ts)
• File-based token persistence (.spacetimedb-token) instead of localStorage
• Table change callbacks (onInsert, onDelete)
• Graceful shutdown handlers for SIGINT/SIGTERM
• Pre-generated module bindings in src/module_bindings/

Documentation (docs/docs/00100-intro/00200-quickstarts/00300-nodejs.md)

• Step-by-step quickstart guide following existing pattern
• Covers project creation with spacetime dev --template nodejs-ts
• Explains project structure and client code
• Documents interactive CLI commands (list, hello, <name>)
• Covers Node.js-specific considerations (WebSocket support, token storage)
• Documents environment variable configuration (SPACETIMEDB_HOST, SPACETIMEDB_DB_NAME)

Consistency

• Environment variables follow the same HOST/DB_NAME naming convention as other quickstarts
• Documentation structure mirrors React and Next.js quickstarts

API and ABI breaking changes

None.

Expected complexity level and risk

1 - Additive change only. New template and documentation, no modifications to existing functionality.

Testing

• Run spacetime dev --template nodejs-ts and verify project initializes
• Run npm run dev and verify connection to SpacetimeDB
• Test adding a person by typing a name
• Test list command shows all people
• Test hello command calls reducer (check server logs)
• Verify token persistence works across restarts
• Test graceful shutdown with Ctrl+C
• Check documentation renders correctly