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/main.py

@@ -44,6 +44,7 @@ from app.routers import tests as tests_router
 from app.routers import evidence as evidence_router
 from app.routers import test_templates as test_templates_router
 from app.routers import procedure_suggestions as procedure_suggestions_router
+from app.routers import template_suggestions as template_suggestions_router
 from app.routers import system as system_router
 from app.routers import metrics as metrics_router
 from app.routers import users as users_router
@@ -215,6 +216,7 @@ app.include_router(evidence_router.router, prefix="/api/v1")
 # Call app.include_router()
 app.include_router(test_templates_router.router, prefix="/api/v1")
 app.include_router(procedure_suggestions_router.router, prefix="/api/v1")
+app.include_router(template_suggestions_router.router, prefix="/api/v1")
 # Call app.include_router()
 app.include_router(system_router.router, prefix="/api/v1")
 # Call app.include_router()