fix(go-agent): missing input form for ExeSQL and Browser agent nodes (#16675)

## Summary
- Add Go dynamic input form support for ExeSQL and Browser components.
- Align their input form metadata with the Python implementation.
- Add regression tests for `/components/:component_id/input-form`.

internal/agent/component/browser.go

@@ -334,6 +334,19 @@ func (b *BrowserComponent) Inputs() map[string]string {
 	}
 }
 
+func (b *BrowserComponent) GetInputForm() map[string]any {
+	return map[string]any{
+		"prompts": map[string]any{
+			"type": "text",
+			"name": "Prompts",
+		},
+		"upload_sources": map[string]any{
+			"type": "line",
+			"name": "Upload sources",
+		},
+	}
+}
+
 // Outputs returns the response surface.
 func (b *BrowserComponent) Outputs() map[string]string {
 	return map[string]string{

internal/agent/component/universe_a_wrappers.go

@@ -517,6 +517,15 @@ func (c *exesqlComponent) Inputs() map[string]string {
 	}
 }
 
+func (c *exesqlComponent) GetInputForm() map[string]any {
+	return map[string]any{
+		"sql": map[string]any{
+			"name": "SQL",
+			"type": "line",
+		},
+	}
+}
+
 func (c *exesqlComponent) Outputs() map[string]string {
 	return map[string]string{
 		"columns": "Result-set column names.",