feat: PIT Channel plugin v1.0.0 - complete implementation

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.0.0] - 2026-03-14
+
+### Added
+- Initial release of PIT Bot Channel Plugin
+- WebSocket connection to PIT Router
+- Message send/receive with acknowledgment
+- Smart message chunking for long text
+- Message queue for offline messages
+- Automatic reconnection with exponential backoff
+- Heartbeat mechanism with timeout detection
+- Metrics collection (connection success/failure, message latency)
+- Web UI for configuration management
+- Multi-account support
+- Environment variable support for auth tokens
+- Configuration validation and migration
+
+### Security
+- Auth token support via environment variables
+- Secure WebSocket (wss://) support
+
+[Unreleased]: https://github.com/your-org/openclaw-pit-bot/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/your-org/openclaw-pit-bot/releases/tag/v1.0.0