feat(test-catalog): add template creation and lead-approval workflow

Leads get a Create Template button that adds directly to the catalog
(existing POST /test-templates). Operators (red_tech/blue_tech) get the
same button, but their proposal now lands in a new template_suggestions
review queue instead — a lead on their team can approve it as-is, edit
fields before approving, or discard it. Modeled on the existing
ProcedureSuggestion review workflow.

backend/app/models/__init__.py

@@ -46,6 +46,7 @@ from app.models.test import Test
 from app.models.test_round_history import TestRoundHistory
 from app.models.test_template import TestTemplate
 from app.models.procedure_suggestion import ProcedureSuggestion
+from app.models.template_suggestion import TemplateSuggestion
 from app.models.user import User
 
 # Assign __all__ = [
@@ -90,4 +91,5 @@ __all__ = [
     "AlertInstance",
     "TestRoundHistory",
     "ProcedureSuggestion",
+    "TemplateSuggestion",
 ]