printedparts stage 9: reports - stock w/ reconcile, consumption, by-person

Three jwt-optional endpoints with ?format=csv, merged into the reports
hub via get_reports while the plugin is enabled. The stock report's
ledgerdelta column is the reconcile check: 0 for every item whose
stock moved through the ledger, nonzero for anything that bypassed it
(the hand-seeded dev rows demonstrate the catch). MySQL SUM returns
Decimal - cast to int or the delta serializes as a string.

plugins/printedparts/plugin.py

@@ -62,6 +62,32 @@ class PrintedpartsPlugin(BasePlugin):
              'printedparts'),
         ]
 
+    def get_reports(self) -> List[dict]:
+        return [
+            {
+                'id': 'printedparts-stock',
+                'name': '3D Parts Stock',
+                'description': 'Stock levels with low-stock flags and the '
+                               'cache-vs-ledger reconcile check',
+                'category': 'inventory',
+                'endpoint': '/api/printedparts/reports/stock',
+            },
+            {
+                'id': 'printedparts-consumption',
+                'name': '3D Parts Consumption',
+                'description': 'Takes per item over a date range',
+                'category': 'usage',
+                'endpoint': '/api/printedparts/reports/consumption',
+            },
+            {
+                'id': 'printedparts-by-person',
+                'name': '3D Parts by Person',
+                'description': 'Takes grouped by employee',
+                'category': 'usage',
+                'endpoint': '/api/printedparts/reports/by-person',
+            },
+        ]
+
     def get_navigation_items(self) -> List[dict]:
         return [
             {