Create wiki page 'Development Setup'

Development-Setup.md

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+# Development Setup
+
+## Prerequisites
+
+| Tool | Purpose |
+|---|---|
+| Rust (stable) | Backend |
+| Node.js + Bun | Frontend |
+| PostgreSQL | Database |
+| Docker + Docker Compose | Optional: run deps in containers |
+
+## Backend
+
+```bash
+cd thoughts-backend
+
+# Copy and fill in env
+cp .env.example .env
+
+# Run migrations
+cargo run -p migration
+
+# Start the backend (tokio runtime)
+cargo run -p thoughts-backend
+```
+
+The backend starts on `http://localhost:3001` by default.
+
+### Environment Variables (`thoughts-backend/.env.example`)
+
+```
+DATABASE_URL=postgres://user:pass@localhost:5432/thoughts
+JWT_SECRET=your-secret-here
+```
+
+### Running Tests
+
+```bash
+cd thoughts-backend
+
+# All tests (requires running PostgreSQL)
+cargo test
+
+# API integration tests only
+cargo test -p thoughts-backend --test api
+```
+
+Tests spin up a test database; set `TEST_DATABASE_URL` in `.env` if it differs from `DATABASE_URL`.
+
+---
+
+## Frontend
+
+```bash
+cd thoughts-frontend
+
+# Copy and fill in env
+cp .env.example .env.local
+
+# Install dependencies
+bun install
+
+# Start dev server
+bun dev
+```
+
+The frontend starts on `http://localhost:3000` and proxies `/api/*` to the backend.
+
+### Environment Variables (`thoughts-frontend/.env.example`)
+
+```
+NEXT_PUBLIC_API_URL=http://localhost:3001
+```
+
+---
+
+## Running Everything with Docker Compose
+
+For a fully isolated local environment:
+
+```bash
+# Start all services (backend, frontend, postgres, nginx)
+docker compose up
+
+# Or just the database and let services run natively
+docker compose up database
+```
+
+The `compose.yml` at the repo root defines all services for local development.
+
+---
+
+## Project Structure
+
+```
+thoughts/
+├── compose.yml              # Dev Docker Compose
+├── compose.prod.yml         # Production Docker Compose
+├── nginx/                   # Nginx config
+├── thoughts-backend/        # Rust backend (workspace)
+│   ├── api/                 # HTTP layer
+│   ├── app/                 # Business logic
+│   ├── models/              # Domain types
+│   ├── common/              # Shared utilities
+│   ├── doc/                 # OpenAPI generation
+│   ├── migration/           # DB migrations
+│   └── utils/               # Test helpers
+└── thoughts-frontend/       # Next.js frontend
+    ├── app/                 # App Router pages
+    ├── components/          # React components
+    ├── hooks/               # Custom hooks
+    └── lib/                 # API client, utils
+```