Refactor embedded assets and drop unnecessary dependencies (#34692)

Benefits:

1. smaller binary size (reduces more than 1MB)
2. better control of the assets details
3. fewer unmaintained dependencies
4. faster startup if the assets are not needed
5. won't hang up editors when open "bindata.go" by accident

modules/options/options_bindata.go

@@ -3,6 +3,21 @@
 
 //go:build bindata
 
+//go:generate go run ../../build/generate-bindata.go ../../options bindata.dat
+
 package options
 
-//go:generate go run ../../build/generate-bindata.go ../../options options bindata.go
+import (
+	"sync"
+
+	_ "embed"
+
+	"code.gitea.io/gitea/modules/assetfs"
+)
+
+//go:embed bindata.dat
+var bindata []byte
+
+var BuiltinAssets = sync.OnceValue(func() *assetfs.Layer {
+	return assetfs.Bindata("builtin(bindata)", assetfs.NewEmbeddedFS(bindata))
+})

modules/options/static.go

@@ -1,14 +0,0 @@
-// Copyright 2022 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-//go:build bindata
-
-package options
-
-import (
-	"code.gitea.io/gitea/modules/assetfs"
-)
-
-func BuiltinAssets() *assetfs.Layer {
-	return assetfs.Bindata("builtin(bindata)", Assets)
-}