Deno quickstart

[bradleyshep]

Description of Changes

Adds a Deno quickstart template and documentation.

Template (templates/deno-ts/):

• deno.json with tasks and import map for spacetimedb
• src/main.ts using Deno-native APIs (Deno.stdin, Deno.readTextFile, Deno.writeTextFile, Deno.env)
• spacetimedb/ server module (TypeScript)
• Pre-generated module_bindings/

Documentation (docs/docs/00100-intro/00200-quickstarts/00275-deno.md):

• Step-by-step quickstart following existing pattern
• Covers project structure, tables/reducers, running the client, CLI usage
• Documents Deno-specific features: permissions, built-in TypeScript, import maps, no node_modules
• Explains --unstable-sloppy-imports flag (required because generated bindings use extensionless imports)

API and ABI breaking changes

None. This is a new template and documentation addition.

Expected complexity level and risk

1 - Trivial addition. New template files and documentation only, no changes to existing code or generator.

Testing

• Server module publishes successfully
• Bindings generate correctly
• Run deno task start and verify connection to SpacetimeDB
• Test interactive CLI commands: add names, list, hello