Implement complete log streaming and metrics persistence system

[elchinoo]

Overview

This PR implements a comprehensive log streaming and metrics persistence system for StormDB v2, including a React frontend and complete backend infrastructure for real-time monitoring and data persistence.

Frontend Features

React Web Client

• Dual-panel interface with test submission and history
• Real-time status polling for running tests
• Log streaming from active test runs
• Historical test runs with detailed status tracking
• Clean, responsive UI with proper styling

Technical Implementation

• React 19.1.0 + TypeScript + Vite 7.0.4
• Proxy configuration for seamless API integration
• Real-time polling with proper error handling
• Component-based architecture

Backend Improvements

Logging System

• Configurable logging (file/database/log system)
• Database log persistence with test run association
• Structured logging with JSON and text formats
• Test run context propagation through all components

Database Schema

• New logs table for persistent log storage
• Enhanced metrics storage with proper foreign keys
• Migration system for schema updates
• Complete result persistence for all plugin metrics

API Enhancements

• Log retrieval endpoint with pagination support
• Real-time test monitoring capabilities
• Comprehensive error handling and validation
• Test run management with proper state tracking

Plugin Improvements

• Context-aware logging with test run ID propagation
• Database result storage for all plugin metrics
• Proper error handling and recovery
• Enhanced test coverage (30%+ for both plugins)

System Reliability

Startup Recovery

• Stuck test detection and automatic recovery
• Database state consistency validation
• Graceful error handling for interrupted tests

Test Infrastructure

• Updated mock interfaces for new logger methods
• Comprehensive validation for plugin configurations
• Improved test coverage with realistic scenarios
• Clean build system with proper dependency management

What's Fixed

1. Empty database issue - Plugins now properly persist metrics to database
2. Log streaming - Real-time logs available through API and UI
3. Stuck test states - Automatic recovery on server restart
4. Context propagation - Test run IDs properly passed through execution chain
5. Configuration validation - Robust validation for all plugin configs
6. Build system - Clean compilation for all components

Testing

• ✅ All Go tests passing
• ✅ 32.3% coverage for bulk-load plugin
• ✅ 29.9% coverage for tpcc-scalability plugin
• ✅ Clean build for all components
• ✅ Plugin loading and execution verified
• ✅ Database persistence confirmed
• ✅ Frontend-backend integration tested

Migration Notes

1. Run database migrations to add the logs table
2. Update configuration for logging preferences
3. Rebuild plugins with new interfaces
4. No breaking changes to existing API endpoints

This PR transforms StormDB from a basic testing tool into a comprehensive performance monitoring platform with real-time visibility and persistent data storage.