Create CHANGELOG:md

Author: Its4Nik

CHANGELOG:md

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+## [v3.0.0] - 2025-05-21
+
+### 🚀 Major Refactor & Platform Upgrade
+
+- Migrated from Node.js to Bun runtime for enhanced performance
+- Switched to the Elysia.js web framework
+
+### ✨ New Features
+
+- Plugin system for custom logic and notifications
+- Real-time Docker container metrics over WebSocket
+- Multi-host Docker environment monitoring
+- Compose stack deployment and management
+- Historical stats storage using SQLite
+- Swagger API documentation for all endpoints
+- Integrated web dashboard ([DockStat](https://github.com/its4nik/DockStat)) for visualization
+
+### 🛠️ Enhancements
+
+- Type-safe tRPC procedures for API communication
+- Improved logging and error handling
+- Comprehensive database abstraction layer
+- Robust Docker host connection management
+
+### 🏗️ Build & CI
+
+- Updated Dockerfile to support Bun and multi-stage builds
+- GitHub Actions workflows for CI/CD, testing, and build verification
+- Multi-platform Docker image builds
+- Dependency graph generation in CI
+
+### ⚠️ Breaking Changes
+
+- Bun and Elysia.js migration requires new deployment and configuration procedures
+- Plugin system and stack management introduce API and integration changes
+
+### 🧪 Testing & Documentation
+
+- Automated testing and build verification via CI
+- Swagger-generated API documentation
+
+---
+
+**Note:** This release marks a comprehensive rewrite and feature expansion, laying the foundation for a robust, extensible Docker monitoring and management platform.