feat: add production templates API and documentation for manufacturing phase 2

- Implemented CRUD operations for production templates, including listing, retrieving, creating, updating, and deactivating templates.
- Introduced a new API contract for production runs, detailing the lifecycle from creation to completion, including handling of stock inputs and outputs.
- Documented the architecture, requirements, entity model, and API contract for the manufacturing phase 2, ensuring clarity on the production process and its integration with existing systems.

Frontend/erp-system/components/Layouts/AppSidebar.tsx

@@ -341,9 +341,9 @@ export function AppSidebar() {
   // flashing the full menu to a restricted role. Once resolved, a nav item
   // is visible if its own code is granted, or (for parents) if any child is.
   //
-  // "procurement" and "hrm" are exempted from that check (frontend-only): no role is
-  // currently seeded with NAV:procurement/NAV:hrm or their children server-side, which
-  // would hide the whole section for everyone. Remove each bypass once roles are granted
+  // "procurement", "hrm" and "production" are exempted from that check (frontend-only): no
+  // role is currently seeded with NAV:procurement/NAV:hrm/NAV:production or their children
+  // server-side, which would hide the whole section for everyone. Remove each bypass once roles are granted
   // the permission properly (Settings → Roles → Sidebar permissions) or a backend seed
   // grants it. This is also flagged in 02-SECURITY.md as the AR-09 sidebar-visibility
   // stopgap for HRM's salary/PII data — it hides HRM from the UI but doesn't enforce