[Soroban] Add a contract template system for common project types

[Atharv777]

Summary

Add a template system for creating new Soroban projects from common starter patterns such as token contracts, NFT contracts, and governance contracts.

Why this matters

New users need a fast way to start building without writing boilerplate manually. Templates drastically reduce friction and make the IDE feel purpose-built for Soroban development.

Scope

• Add template selection during project creation
• Provide starter templates for:
  • token contract
  • NFT contract
  • DAO/governance contract
  • minimal hello-world contract
• Generate correct folder and file structure
• Pre-fill README/setup guidance

Acceptance Criteria

• User can choose a template when creating a project
• Each template creates a valid working Soroban project
• Files are immediately editable
• Templates are easily extendable

Files Involved

• server/project_routes.py
• server/db_utils.py
• pages/app/index.jsx
• components/*
• templates/*

Difficulty

Medium

Labels: blockchain soroban enhancement