chore(dev): add development tooling and automation

- Add .nvmrc to enforce Node 14 requirement
- Add .prettierrc for consistent code formatting
- Add setup-dev.sh for automated project setup
  - Validates Node version
  - Installs dependencies
  - Creates config.json from template
  - Provides clear instructions

Improves developer onboarding and prevents Node version issues.

Author: CybotTM

.nvmrc

@@ -0,0 +1,2 @@
+14
+

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "parser": "babel"
+}
+

setup-dev.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+# Development setup script for timetracker-ui
+
+set -e
+
+echo "🚀 Setting up timetracker-ui for development..."
+
+# Check Node version
+NODE_VERSION=$(node -v | cut -d'v' -f2 | cut -d'.' -f1)
+if [ "$NODE_VERSION" -lt 14 ] || [ "$NODE_VERSION" -gt 16 ]; then
+  echo "⚠️  Warning: Node $NODE_VERSION detected. This project requires Node 14-16."
+  echo "   Run 'nvm use 14' to switch to the correct version."
+  exit 1
+fi
+
+echo "✅ Node $(node -v) detected"
+
+# Install dependencies
+echo "📦 Installing dependencies..."
+npm install
+
+# Create config.json if it doesn't exist
+if [ ! -f "static/config.json" ]; then
+  echo "📝 Creating static/config.json from template..."
+  cp static/config.json.dist static/config.json
+  echo "✅ Created static/config.json (you can customize this file)"
+else
+  echo "✅ static/config.json already exists"
+fi
+
+# Install proxy service dependencies
+echo "📦 Installing proxy service dependencies..."
+cd srv && npm install
+cd ..
+
+echo ""
+echo "✅ Setup complete! You can now run:"
+echo ""
+echo "   TIMETRACKER_URL=https://tt.netresearch.de/ npm run dev"
+echo ""
+echo "   The dev server will start on http://0.0.0.0:8081"
+echo ""
+