refactor: add hot reloading and improve logging functions

- Add command to install `air` for hot reloading in `Makefile`
- Add `dev` command to run the application with hot reload in `Makefile`
- Add `vendor` command to tidy and verify module dependencies in `Makefile`
- Update log synchronization method to use `log.Default().Sync()` in `cmd/cmd.go`
- Change variadic parameter type from `interface{}` to `any` in logging functions
- Remove `Sync` function from `pkg/log/log.go`

ref: https://github.com/uber-go/zap/issues/880
Signed-off-by: appleboy <appleboy.tw@gmail.com>

Makefile

@@ -3,4 +3,23 @@ EXECUTABLE := gitea-mcp
 
 .PHONY: build
 build:
-	$(GO) build -v -ldflags '-s -w' -o $(EXECUTABLE)
+	$(GO) build -v -ldflags '-s -w' -o $(EXECUTABLE)
+
+## air: install air for hot reload
+.PHONY: air
+air:
+	@hash air > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		$(GO) install github.com/air-verse/air@latest; \
+	fi
+
+## dev: run the application with hot reload
+.PHONY: dev
+dev: air
+	air --build.cmd "make build" --build.bin ./gitea-mcp
+
+## vendor: tidy and verify module dependencies
+.PHONY: vendor
+vendor:
+	@echo 'Tidying and verifying module dependencies...'
+	go mod tidy
+	go mod verify