Add development.md documentation for developer onboarding

[Copilot]

Adds comprehensive developer documentation to streamline onboarding and standardize development practices across the full-stack JavaScript codebase.

Documentation Structure

• Architecture & Setup: Client-server overview, prerequisites (Node.js 18+, PostgreSQL 15+), Google OAuth configuration, environment setup
• Development Workflows: Frontend (Vite), Backend (Express + TypeScript + Prisma), database migrations, local/staging/production environments
• API Reference: Authentication, Games, Sessions endpoints with ownership models
• Contribution Guide: Git workflow, PR process, issue referencing conventions, testing approach
• Troubleshooting: Common failure scenarios for CORS, database connections, build processes

Key Technical Details

• Documents existing mobile touch/zoom functionality (referenced from Feat: create a "re-centre" button #58) and notes future re-center button enhancement
• Clarifies PostgreSQL SSL requirements differ for local vs. production (NeonDB)
• Recommends Vitest over Jest for Vite configuration compatibility
• Maps deployment targets: GitHub Pages (static assets) + Vercel (serverless API)

File Coverage

Single file: development.md (727 lines)

Complements existing README.md and backend/README.md with operational details for active development.

Original prompt

Create a development.md documentation file for the "String-sg/bingo-string" repository. Make sure to include key information and guidelines derived from issue #58 and the main codebase.

This pull request was created from Copilot chat.

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Project	Deployment	Actions	Updated (UTC)
bingo-string	Ready	Preview, Comment	Feb 14, 2026 1:38am