chore(deps): update all dependencies to latest (#212)

Bumps all direct dependencies to their latest versions.

| Dependency                    | From    | To           |
| ----------------------------- | ------- | ------------ |
| `gitea.dev/sdk`               | v1.0.1  | v1.2.0       |
| `github.com/mark3labs/mcp-go` | v0.45.0 | v0.56.0      |
| `go.uber.org/zap`             | v1.27.1 | v1.28.0      |
| `go.uber.org/zap/exp`         | —       | v0.3.0 (new) |

### Required code change
mcp-go v0.56 moved transport logging to `log/slog` and renamed the streamable-HTTP logger option to `WithStreamableHTTPLogger(*slog.Logger)`. Added a `log.Slog()` bridge (via the official `zapslog` adapter) so the HTTP transport keeps logging through the existing zap pipeline, and switched `operation.go` to the new option.

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-on: https://gitea.com/gitea/gitea-mcp/pulls/212
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: bircni <bircni@icloud.com>

pkg/log/log.go

@@ -1,6 +1,7 @@
 package log
 
 import (
+	"log/slog"
 	"os"
 	"sync"
 	"time"
@@ -8,6 +9,7 @@ import (
 	"gitea.com/gitea/gitea-mcp/pkg/flag"
 
 	"go.uber.org/zap"
+	"go.uber.org/zap/exp/zapslog"
 	"go.uber.org/zap/zapcore"
 	"gopkg.in/natefinch/lumberjack.v2"
 )
@@ -79,6 +81,13 @@ func SetDefault(logger *zap.Logger) {
 	}
 }
 
+// Slog returns a *slog.Logger that writes through the default zap logger,
+// so structured logging from dependencies (e.g. the MCP HTTP transport) shares
+// the same destination and formatting as the rest of the server.
+func Slog() *slog.Logger {
+	return slog.New(zapslog.NewHandler(Default().Core()))
+}
+
 func Debug(msg string, fields ...zap.Field) {
 	Default().Debug(msg, fields...)
 }