add backend support for real time in-room text chat

functions/realtime-chat/.env.example

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+# Appwrite Configuration
+APPWRITE_API_KEY=your_appwrite_api_key_here
+APPWRITE_FUNCTION_PROJECT_ID=your_project_id_here
+APPWRITE_ENDPOINT=https://cloud.appwrite.io/v1
+
+# Database Configuration
+MASTER_DATABASE_ID=your_master_database_id_here
+ROOMS_TABLE_ID=your_rooms_table_id_here
+MESSAGES_TABLE_ID=your_messages_table_id_here
+
+# Optional: LiveKit Configuration (if needed for enhanced integration)
+LIVEKIT_HOST=your_livekit_host_here
+LIVEKIT_API_KEY=your_livekit_api_key_here
+LIVEKIT_API_SECRET=your_livekit_api_secret_here
+
+# Optional: Rate Limiting Configuration
+RATE_LIMIT_MAX_REQUESTS=10
+RATE_LIMIT_WINDOW_MS=60000
+
+# Optional: Message Configuration
+MAX_MESSAGE_LENGTH=1000
+MESSAGE_HISTORY_LIMIT=50
+
+# Optional: Security Configuration
+ENABLE_PROFANITY_FILTER=true
+ENABLE_XSS_PROTECTION=true
+ENABLE_RATE_LIMITING=true

functions/realtime-chat/.gitignore

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+# Dependencies
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Environment variables
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage/
+
+# nyc test coverage
+.nyc_output
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Optional npm cache directory
+.npm
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# next.js build output
+.next
+
+# nuxt.js build output
+.nuxt
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db

functions/realtime-chat/.prettierrc.json

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+{
+  "semi": true,
+  "trailingComma": "es5",
+  "singleQuote": true,
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false,
+  "bracketSpacing": true,
+  "arrowParens": "avoid"
+}