[BACKEND] Initialize Go backend structure and dependencies (#23)

server/.env.example

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+# Chat Switchboard - Server Environment Variables
+# Copy this file to .env and fill in the values
+
+# Server settings
+PORT=8080
+ENVIRONMENT=development
+DEBUG=true
+
+# Database settings (PostgreSQL)
+DB_HOST=localhost
+DB_PORT=5432
+DB_USER=chat_switchboard
+DB_PASSWORD=your-secure-password-here
+DB_NAME=chat_switchboard
+DB_SSL_MODE=disable
+DB_MAX_CONNS=25
+
+# JWT settings
+JWT_SECRET=your-super-secret-jwt-key-change-in-production
+JWT_EXPIRATION=24h
+JWT_ISSUER=chat-switchboard
+
+# CORS settings (comma-separated for multiple origins)
+CORS_ALLOWED_ORIGINS=http://localhost:3000,http://localhost:8080
+CORS_ALLOWED_METHODS=GET,POST,PUT,DELETE,OPTIONS,PATCH
+CORS_ALLOWED_HEADERS=Content-Type,Authorization,X-Requested-With,Accept,Origin
+
+# Rate limiting
+RATE_LIMIT_REQUESTS=100
+RATE_LIMIT_WINDOW=1m
+
+# Logging
+LOG_LEVEL=info
+
+# Optional: Redis configuration (for WebSocket pub/sub and session cache)
+# REDIS_HOST=localhost
+# REDIS_PORT=6379
+# REDIS_DB=0
+# REDIS_PASSWORD=
+
+# Optional: External services
+# OPENAI_API_KEY=
+# ANTHROPIC_API_KEY=
+# GOOGLE_API_KEY=