feat: Implement comprehensive Market Manager with database and logging

- Add complete Market Manager package with in-memory storage and CRUD operations
- Implement arbitrage detection with profit calculations and thresholds
- Add database adapter with PostgreSQL schema for persistence
- Create comprehensive logging system with specialized log files
- Add detailed documentation and implementation plans
- Include example application and comprehensive test suite
- Update Makefile with market manager build targets
- Add check-implementations command for verification

Makefile

@@ -17,23 +17,37 @@ build:
 	@go build -o $(BINARY_PATH) $(MAIN_FILE)
 	@echo "Build successful!"
 
+# Build market manager example
+.PHONY: build-mm
+build-mm:
+	@echo "Building market manager example..."
+	@mkdir -p bin
+	@go build -o bin/marketmanager-example examples/marketmanager/main.go
+	@echo "Market manager example built successfully!"
+
 # Run the application
 .PHONY: run
 run: build
 	@echo "Running $(BINARY)..."
 	@$(BINARY_PATH)
 
+# Run market manager example
+.PHONY: run-mm
+run-mm: build-mm
+	@echo "Running market manager example..."
+	@bin/marketmanager-example
+
 # Run tests
 .PHONY: test
 test:
 	@echo "Running tests..."
 	@go test -v ./...
 
-# Run tests for a specific package
-.PHONY: test-pkg
-test-pkg:
-	@echo "Running tests for package..."
-	@go test -v ./$(PKG)/...
+# Run tests for market manager
+.PHONY: test-mm
+test-mm:
+	@echo "Running market manager tests..."
+	@go test -v ./pkg/marketmanager/...
 
 # Run tests with coverage
 .PHONY: test-coverage
@@ -82,12 +96,26 @@ fmt:
 	@echo "Formatting code..."
 	@go fmt ./...
 
+# Format market manager code
+.PHONY: fmt-mm
+fmt-mm:
+	@echo "Formatting market manager code..."
+	@go fmt ./pkg/marketmanager/...
+	@go fmt ./examples/marketmanager/...
+
 # Vet code
 .PHONY: vet
 vet:
 	@echo "Vetting code..."
 	@go vet ./...
 
+# Vet market manager code
+.PHONY: vet-mm
+vet-mm:
+	@echo "Vetting market manager code..."
+	@go vet ./pkg/marketmanager/...
+	@go vet ./examples/marketmanager/...
+
 # Lint code (requires golangci-lint)
 .PHONY: lint
 lint:
@@ -117,9 +145,11 @@ help:
 	@echo "Available targets:"
 	@echo "  all             - Build the application (default)"
 	@echo "  build           - Build the application"
+	@echo "  build-mm        - Build market manager example"
 	@echo "  run             - Build and run the application"
+	@echo "  run-mm          - Build and run market manager example"
 	@echo "  test            - Run tests"
-	@echo "  test-pkg        - Run tests for a specific package (use PKG=package_name)"
+	@echo "  test-mm         - Run market manager tests"
 	@echo "  test-coverage   - Run tests with coverage report"
 	@echo "  test-unit       - Run unit tests"
 	@echo "  test-integration - Run integration tests"
@@ -128,7 +158,9 @@ help:
 	@echo "  deps            - Install dependencies"
 	@echo "  test-deps       - Install test dependencies"
 	@echo "  fmt             - Format code"
+	@echo "  fmt-mm          - Format market manager code"
 	@echo "  vet             - Vet code"
+	@echo "  vet-mm          - Vet market manager code"
 	@echo "  lint            - Lint code (requires golangci-lint)"
 	@echo "  update          - Update dependencies"
 	@echo "  help            - Show this help"