feat(epic1): complete OpenTelemetry integration and add verification documentation

Story 1.6: OpenTelemetry Distributed Tracing
- Implemented tracer initialization with stdout (dev) and OTLP (prod) exporters
- Added HTTP request instrumentation via Gin middleware
- Integrated trace ID correlation in structured logs
- Added tracing configuration to config files
- Registered tracer provider in DI container

Documentation and Setup:
- Created Docker Compose setup for PostgreSQL database
- Added comprehensive Epic 1 summary with verification instructions
- Added Epic 0 summary with verification instructions
- Linked summaries in documentation index and epic READMEs
- Included detailed database testing instructions
- Added Docker Compose commands and troubleshooting guide

All Epic 1 stories (1.1-1.6) are now complete. Story 1.7 depends on Epic 2.

docs/content/stories/epic0/README.md

@@ -44,3 +44,7 @@ Initialize repository structure with proper Go project layout, implement configu
 - Config loads from `config/default.yaml`
 - Logger can be injected and used
 - Application starts and shuts down gracefully
+
+## Implementation Summary
+
+- [Implementation Summary and Verification Instructions](./SUMMARY.md) - Complete guide on how to verify all Epic 0 functionality

docs/content/stories/epic0/SUMMARY.md

@@ -0,0 +1,152 @@
+# Epic 0: Implementation Summary
+
+## Overview
+
+Epic 0 establishes the foundation of the Go Platform project with core infrastructure components that enable all future development. This epic includes project initialization, configuration management, structured logging, CI/CD pipeline, and dependency injection setup.
+
+## Completed Stories
+
+### ✅ 0.1 Project Initialization
+- Go module initialized with proper module path
+- Complete directory structure following Clean Architecture
+- `.gitignore` configured for Go projects
+- Comprehensive README with project overview
+
+### ✅ 0.2 Configuration Management System
+- `ConfigProvider` interface in `pkg/config/`
+- Viper-based implementation in `internal/config/`
+- YAML configuration files in `config/` directory
+- Environment variable support with automatic mapping
+- Type-safe configuration access methods
+
+### ✅ 0.3 Structured Logging System
+- `Logger` interface in `pkg/logger/`
+- Zap-based implementation in `internal/logger/`
+- JSON and console output formats
+- Configurable log levels
+- Request ID and context-aware logging support
+
+### ✅ 0.4 CI/CD Pipeline
+- GitHub Actions workflow for automated testing and linting
+- Comprehensive Makefile with common development tasks
+- Automated build and test execution
+
+### ✅ 0.5 Dependency Injection and Bootstrap
+- DI container using Uber FX in `internal/di/`
+- Provider functions for core services
+- Application entry point in `cmd/platform/main.go`
+- Lifecycle management with graceful shutdown
+
+## Verification Instructions
+
+### Prerequisites
+- Go 1.24 or later installed
+- Make installed (optional, for using Makefile commands)
+
+### 1. Verify Project Structure
+
+```bash
+# Check Go module
+go mod verify
+
+# Check directory structure
+ls -la
+# Should see: cmd/, internal/, pkg/, config/, docs/, etc.
+```
+
+### 2. Verify Configuration System
+
+```bash
+# Build the application
+go build ./cmd/platform
+
+# Check if config files exist
+ls -la config/
+# Should see: default.yaml, development.yaml, production.yaml
+
+# Test config loading (will fail without database, but config should load)
+# This will be tested in Epic 1 when database is available
+```
+
+### 3. Verify Logging System
+
+```bash
+# Run tests for logging
+go test ./internal/logger/...
+
+# Expected output: Tests should pass
+```
+
+### 4. Verify CI/CD Pipeline
+
+```bash
+# Run linting (if golangci-lint is installed)
+make lint
+
+# Run tests
+make test
+
+# Build the application
+make build
+# Binary should be created in bin/platform
+
+# Run all checks
+make check
+```
+
+### 5. Verify Dependency Injection
+
+```bash
+# Build the application
+go build ./cmd/platform
+
+# Check if DI container compiles
+go build ./internal/di/...
+
+# Run the application (will fail without database in Epic 1)
+# go run ./cmd/platform/main.go
+```
+
+### 6. Verify Application Bootstrap
+
+```bash
+# Build the application
+make build
+
+# Check if binary exists
+ls -la bin/platform
+
+# The application should be ready to run (database connection will be tested in Epic 1)
+```
+
+## Testing Configuration
+
+The configuration system can be tested by:
+
+1. **Modifying config files**: Edit `config/default.yaml` and verify changes are loaded
+2. **Environment variables**: Set `ENVIRONMENT=production` and verify production config is loaded
+3. **Type safety**: Configuration access methods (`GetString`, `GetInt`, etc.) provide compile-time safety
+
+## Testing Logging
+
+The logging system can be tested by:
+
+1. **Unit tests**: Run `go test ./internal/logger/...`
+2. **Integration**: Logging will be tested in Epic 1 when HTTP server is available
+3. **Format switching**: Change `logging.format` in config to switch between JSON and console output
+
+## Common Issues and Solutions
+
+### Issue: `go mod verify` fails
+**Solution**: Run `go mod tidy` to update dependencies
+
+### Issue: Build fails
+**Solution**: Ensure Go 1.24+ is installed and all dependencies are downloaded (`go mod download`)
+
+### Issue: Config not loading
+**Solution**: Ensure `config/default.yaml` exists and is in the correct location relative to the binary
+
+## Next Steps
+
+After verifying Epic 0, proceed to [Epic 1](../epic1/SUMMARY.md) to set up the database and HTTP server, which will enable full end-to-end testing of the configuration and logging systems.
+