Expand backend financial statement parsers

rust/taxonomy/fiscal/v1/broker_asset_manager.surface.json

@@ -63,7 +63,7 @@
       "surface_key": "total_assets",
       "statement": "balance",
       "label": "Total Assets",
-      "category": "surface",
+      "category": "derived",
       "order": 90,
       "unit": "currency",
       "rollup_policy": "direct_only",
@@ -77,7 +77,7 @@
       "surface_key": "total_liabilities",
       "statement": "balance",
       "label": "Total Liabilities",
-      "category": "surface",
+      "category": "derived",
       "order": 100,
       "unit": "currency",
       "rollup_policy": "direct_only",
@@ -91,7 +91,7 @@
       "surface_key": "total_equity",
       "statement": "balance",
       "label": "Total Equity",
-      "category": "surface",
+      "category": "equity",
       "order": 110,
       "unit": "currency",
       "rollup_policy": "direct_only",