fix: remove mandatory validation for ReportCollection fields

Remove the validation that required target_url, expected_domain, and
entry_script meta tags for ReportCollection scenes. Third-party scenes
do not have these meta tags, so the generator now uses empty values
that users can manually edit in scene.toml.

🤖 Generated with [Qoder][https://qoder.com]

src/generated_scene/analyzer.rs

@@ -109,31 +109,8 @@ pub fn analyze_scene_source_with_hint(
     let expected_domain = meta_content(&html, "sgclaw-expected-domain");
     let entry_script = meta_content(&html, "sgclaw-entry-script");
 
-    // Validate required fields based on scene kind
-    match scene_kind {
-        SceneKind::ReportCollection => {
-            // ReportCollection requires target_url, expected_domain, and entry_script
-            if target_url.as_deref().unwrap_or_default().trim().is_empty()
-                || expected_domain
-                    .as_deref()
-                    .unwrap_or_default()
-                    .trim()
-                    .is_empty()
-                || entry_script
-                    .as_deref()
-                    .unwrap_or_default()
-                    .trim()
-                    .is_empty()
-            {
-                return Err(AnalyzeSceneError::new(
-                    "report_collection scene requires target_url, expected_domain, and entry_script",
-                ));
-            }
-        }
-        SceneKind::Monitoring => {
-            // Monitoring type has optional fields - no validation needed
-        }
-    }
+    // All fields are optional - generator will use placeholders for missing values
+    // This allows third-party scenes without meta tags to be processed
 
     Ok(SceneSourceAnalysis {
         scene_kind,