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

config/default.yaml

@@ -0,0 +1,18 @@
+environment: development
+
+server:
+  port: 8080
+  host: "0.0.0.0"
+  read_timeout: 30s
+  write_timeout: 30s
+
+database:
+  driver: "postgres"
+  dsn: ""
+  max_connections: 25
+  max_idle_connections: 5
+
+logging:
+  level: "info"
+  format: "json"
+  output: "stdout"

config/development.yaml

@@ -0,0 +1,5 @@
+environment: development
+
+logging:
+  level: "debug"
+  format: "console"

config/production.yaml

@@ -0,0 +1,5 @@
+environment: production
+
+logging:
+  level: "warn"
+  format: "json"