Switch remote deploy to vendored source builds

Move remote deployment to a vendored source bundle built on the target host via Docker so redeploys no longer require local cross-compilation or host Go installation.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

vendor/github.com/wailsapp/wails/v2/pkg/options/assetserver/middleware.go

@@ -0,0 +1,20 @@
+package assetserver
+
+import (
+	"net/http"
+)
+
+// Middleware defines a HTTP middleware that can be applied to the AssetServer.
+// The handler passed as next is the next handler in the chain. One can decide to call the next handler
+// or implement a specialized handling.
+type Middleware func(next http.Handler) http.Handler
+
+// ChainMiddleware allows chaining multiple middlewares to one middleware.
+func ChainMiddleware(middleware ...Middleware) Middleware {
+	return func(h http.Handler) http.Handler {
+		for i := len(middleware) - 1; i >= 0; i-- {
+			h = middleware[i](h)
+		}
+		return h
+	}
+}

vendor/github.com/wailsapp/wails/v2/pkg/options/assetserver/options.go

@@ -0,0 +1,45 @@
+package assetserver
+
+import (
+	"fmt"
+	"io/fs"
+	"net/http"
+)
+
+// Options defines the configuration of the AssetServer.
+type Options struct {
+	// Assets defines the static assets to be used. A GET request is first tried to be served from this Assets. If the Assets returns
+	// `os.ErrNotExist` for that file, the request handling will fallback to the Handler and tries to serve the GET
+	// request from it.
+	//
+	// If set to nil, all GET requests will be forwarded to Handler.
+	Assets fs.FS
+
+	// Handler will be called for every GET request that can't be served from Assets, due to `os.ErrNotExist`. Furthermore all
+	// non GET requests will always be served from this Handler.
+	//
+	// If not defined, the result is the following in cases where the Handler would have been called:
+	//   GET request:   `http.StatusNotFound`
+	//   Other request: `http.StatusMethodNotAllowed`
+	Handler http.Handler
+
+	// Middleware is a HTTP Middleware which allows to hook into the AssetServer request chain. It allows to skip the default
+	// request handler dynamically, e.g. implement specialized Routing etc.
+	// The Middleware is called to build a new `http.Handler` used by the AssetSever and it also receives the default
+	// handler used by the AssetServer as an argument.
+	//
+	// If not defined, the default AssetServer request chain is executed.
+	//
+	// Multiple Middlewares can be chained together with:
+	//   ChainMiddleware(middleware ...Middleware) Middleware
+	Middleware Middleware
+}
+
+// Validate the options
+func (o Options) Validate() error {
+	if o.Assets == nil && o.Handler == nil && o.Middleware == nil {
+		return fmt.Errorf("AssetServer options invalid: either Assets, Handler or Middleware must be set")
+	}
+
+	return nil
+}