feat(devins-lang): improve symbol resolution for file commands

This commit enhances the symbol resolution in DevInLanguage by adding support for line information in commands. It also refactors the code to ensure that the `FoldingDescriptor` is added only when the element's text contains a forward slash, indicating a file path.

exts/devins-lang/src/main/kotlin/cc/unitmesh/devti/language/folding/DevInFileReferenceFoldingBuilder.kt

@@ -24,7 +24,8 @@ class DevInFileReferenceFoldingBuilder : FoldingBuilderEx() {
             override fun visitElement(element: PsiElement) {
                 if (element.elementType == DevInTypes.COMMAND_PROP) {
                     val agentId = element.parent?.findElementAt(1)?.text
-                    if (agentId == "file" && element.text.contains("/")) {
+                    val isAgentBase = agentId == "file" || agentId == "write" || agentId == "run"
+                    if (isAgentBase && element.text.contains("/")) {
                         descriptors.add(FoldingDescriptor(element.node, element.textRange))
                     }
                 }