feat: implement Epic 0 - Project Setup & Foundation

Implemented all 5 stories from Epic 0:

Story 0.1: Project Initialization
- Initialize Go module with path git.dcentral.systems/toolz/goplt
- Create complete directory structure (cmd/, internal/, pkg/, modules/, config/, etc.)
- Add comprehensive .gitignore for Go projects
- Create README.md with project overview and setup instructions

Story 0.2: Configuration Management System
- Define ConfigProvider interface in pkg/config
- Implement Viper-based configuration in internal/config
- Create configuration loader with environment support
- Add default, development, and production YAML config files

Story 0.3: Structured Logging System
- Define Logger interface in pkg/logger
- Implement Zap-based logger in internal/logger
- Add request ID middleware for Gin
- Create global logger export with convenience functions
- Support context-aware logging with request/user ID extraction

Story 0.4: CI/CD Pipeline
- Create GitHub Actions workflow for CI (test, lint, build, fmt)
- Add comprehensive Makefile with development commands
- Configure golangci-lint with reasonable defaults

Story 0.5: Dependency Injection and Bootstrap
- Create FX-based DI container in internal/di
- Implement provider functions for Config and Logger
- Create application entry point in cmd/platform/main.go
- Add lifecycle management with graceful shutdown

All acceptance criteria met:
- go build ./cmd/platform succeeds
- go test ./... runs successfully
- go mod verify passes
- Config loads from config/default.yaml
- Logger can be injected and used
- Application starts and shuts down gracefully

cmd/platform/main.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"go.uber.org/fx"
+	"git.dcentral.systems/toolz/goplt/internal/di"
+	"git.dcentral.systems/toolz/goplt/pkg/logger"
+)
+
+func main() {
+	// Create DI container with lifecycle hooks
+	container := di.NewContainer(
+		// Invoke lifecycle hooks
+		fx.Invoke(di.RegisterLifecycleHooks),
+	)
+
+	// Create root context
+	ctx := context.Background()
+
+	// Start the application
+	if err := container.Start(ctx); err != nil {
+		log := logger.GetGlobalLogger()
+		if log != nil {
+			log.Error("Failed to start application",
+				logger.Error(err),
+			)
+		} else {
+			fmt.Fprintf(os.Stderr, "Failed to start application: %v\n", err)
+		}
+		os.Exit(1)
+	}
+}