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

.golangci.yml

@@ -0,0 +1,52 @@
+# golangci-lint configuration
+# See https://golangci-lint.run/usage/configuration/
+
+run:
+  timeout: 5m
+  tests: true
+  modules-download-mode: readonly
+
+linters:
+  enable:
+    - errcheck
+    - gofmt
+    - goimports
+    - govet
+    - ineffassign
+    - staticcheck
+    - typecheck
+    - unused
+    - gosimple
+    - misspell
+    - revive
+    - gosec
+  disable:
+    - gocritic  # Can be enabled later for stricter checks
+
+linters-settings:
+  revive:
+    rules:
+      - name: exported
+        severity: warning
+      - name: package-comments
+        severity: warning
+  gosec:
+    severity: medium
+  errcheck:
+    check-blank: true
+
+issues:
+  exclude-use-default: false
+  max-issues-per-linter: 0
+  max-same-issues: 0
+  exclude-rules:
+    # Exclude test files from some checks
+    - path: _test\.go
+      linters:
+        - errcheck
+        - gosec
+
+output:
+  format: colored-line-number
+  print-issued-lines: true
+  print-linter-name: true