chore: Remove gitea-vet from build process

Use standard go vet instead of gitea-vet for copyright checks.
This allows MarketAlly copyright headers in new files.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Makefile

@@ -117,8 +117,7 @@ test: fmt-check security-check
 .PHONY: vet
 vet:
 	@echo "Running go vet..."
-	@$(GO) build code.gitea.io/gitea-vet
+	@$(GO) vet $(GO_PACKAGES_TO_VET)
-	@$(GO) vet -vettool=gitea-vet $(GO_PACKAGES_TO_VET)
 
 install: $(GOFILES)
 	$(GO) install -v -tags '$(TAGS)' -ldflags '$(EXTLDFLAGS)-s -w $(LDFLAGS)'

internal/pkg/envcheck/disk_unix.go

@@ -1,8 +1,8 @@
-//go:build unix
+// Copyright 2026 MarketAlly. All rights reserved.
-
-// Copyright 2026 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
+//go:build unix
+
 package envcheck
 
 import (

internal/pkg/envcheck/disk_windows.go

@@ -1,8 +1,8 @@
-//go:build windows
+// Copyright 2026 MarketAlly. All rights reserved.
-
-// Copyright 2026 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
+//go:build windows
+
 package envcheck
 
 import (