Select fields: inline static options

A select requirement can now declare a plain options: [A, B, C] list
instead of a resource - each string is both value and label. Restores
the ancestor question format's inline enums (used by the klingenberg
port) without needing a resource endpoint for a fixed list.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y42TyF8Zu7NGRR2893vNcZ

src/resource.rs

@@ -68,6 +68,16 @@ pub async fn get_requirement_options(
         .iter()
         .find(|r| r.name == requirement_name)
         .ok_or_else(|| ServerFnError::new("unknown requirement"))?;
+    // Inline options: return them as {id,label} objects, the shape the
+    // SelectField renders, without touching a resource.
+    if !requirement.options.is_empty() {
+        let items: Vec<serde_json::Value> = requirement
+            .options
+            .iter()
+            .map(|o| serde_json::json!({ "id": o, "label": o }))
+            .collect();
+        return Ok(serde_json::Value::Array(items));
+    }
     let resource = requirement
         .resource
         .as_ref()