chore(ci): add govulncheck, staticcheck, go vet, gofumpt gates

* Add lint/format checks to the Gitea release workflow and Makefile
  (targets: vet, fmt, fmt-check, staticcheck, govulncheck, check)
* Switch .golangci.json formatter from gofmt to gofumpt (extra.group-params)
* Bump golang.org/x/text 0.37.0 -> 0.39.0 for GO-2026-5970; re-vendor
* Fix staticcheck S1011 in pkg/diff; drop unused pgsql writer helpers
* Fix gocritic unnamedResult (pkg/diff) and rangeValCopy (pkg/pgsql)
* Apply gofumpt + goimports formatting across the tree

pkg/writers/dctx/writer_test.go

@@ -5,9 +5,10 @@ import (
 	"os"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
+
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
 	"git.warky.dev/wdevs/relspecgo/pkg/writers"
-	"github.com/stretchr/testify/assert"
 )
 
 func TestWriter_WriteSchema(t *testing.T) {
@@ -149,4 +150,4 @@ func TestWriter_WriteSchema(t *testing.T) {
 	// PrimaryMapping should reference foreign table (posts) fields
 	assert.Len(t, relationResult.PrimaryMappings, 1)
 	assert.NotEmpty(t, relationResult.PrimaryMappings[0].Field)
-}
+}