Use golangci-lint fmt to format code (#178)

Use `golangci-lint fmt` to format code, replacing the previous gofumpt-based formatter. https://github.com/daixiang0/gci is used to order the imports.

Mirrors https://github.com/go-gitea/gitea/pull/37194.

---
This PR was written with the help of Claude Opus 4.7

Reviewed-on: https://gitea.com/gitea/gitea-mcp/pulls/178
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-committed-by: silverwind <me@silverwind.io>

pkg/gitea/gitea.go

@@ -7,9 +7,10 @@ import (
 	"fmt"
 	"net/http"
 
-	"code.gitea.io/sdk/gitea"
 	mcpContext "gitea.com/gitea/gitea-mcp/pkg/context"
 	"gitea.com/gitea/gitea-mcp/pkg/flag"
+
+	"code.gitea.io/sdk/gitea"
 )
 
 func NewClient(token string) (*gitea.Client, error) {

pkg/log/log.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"gitea.com/gitea/gitea-mcp/pkg/flag"
+
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 	"gopkg.in/natefinch/lumberjack.v2"

pkg/to/to.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	"gitea.com/gitea/gitea-mcp/pkg/log"
+
 	"github.com/mark3labs/mcp-go/mcp"
 )
 

pkg/tool/tool.go

@@ -2,6 +2,7 @@ package tool
 
 import (
 	"gitea.com/gitea/gitea-mcp/pkg/flag"
+
 	"github.com/mark3labs/mcp-go/server"
 )