feat: add custom Datastar.js configuration support

Allow users to provide their own Datastar.js script (e.g., Datastar Pro
or custom builds) via Via's Options configuration. Adds DatastarConfig
struct with Content ([]byte) and Path (string) fields.

configuration.go

@@ -2,6 +2,17 @@ package via
 
 import "github.com/alexedwards/scs/v2"
 
+// DatastarConfig configures a custom Datastar.js script.
+type DatastarConfig struct {
+	// Content is the Datastar.js script content.
+	// If nil, the embedded default is used.
+	Content []byte
+
+	// Path is the URL path where the script is served.
+	// Defaults to "/_datastar.js" if empty.
+	Path string
+}
+
 type LogLevel int
 
 const (
@@ -37,4 +48,8 @@ type Options struct {
 	// with scs LoadAndSave middleware. Configure the session manager before
 	// passing it (lifetime, cookie settings, store, etc).
 	SessionManager *scs.SessionManager
+
+	// Datastar configures a custom Datastar.js script.
+	// If nil, Via uses its embedded default.
+	Datastar *DatastarConfig
 }