Add interactive project setup wizard to setup-project.sh

[PAMulligan]

Description

Add an interactive mode to `setup-project.sh` that guides users through project configuration with prompts. Currently all options must be passed as CLI flags.

Why

New users shouldn't need to read documentation to create their first project. An interactive wizard with sensible defaults provides a guided experience that's friendlier than memorizing flags.

Acceptance Criteria

• When `setup-project.sh` is called with just a project name (no flags), enter interactive mode
• Prompt for:
  • Deployment target (Cloudflare Workers / Node.js) with default
  • Database provider (PostgreSQL / SQLite) with default based on target
  • Include example routes? (y/N)
  • Initialize git? (Y/n)
• Use `read -p` or `select` for prompts with colored output
• All existing flags continue to work (non-interactive mode)
• `--no-interactive` flag to force non-interactive (for CI usage)
• CI passes

Example

```
$ ./scripts/setup-project.sh my-api

Nerva Project Setup

? Deployment target:

1. Node.js (Docker) [default]
2. Cloudflare Workers

1

? Database provider:

1. PostgreSQL [default]
2. SQLite

1

? Include example routes? (y/N): y
? Initialize git repository? (Y/n): Y

Creating project: my-api (Node.js + PostgreSQL)...
```