Lab editing and group grades

- academic-service: PUT /labs/{id} (title, deadline, defense, points, status,
  description), POST/PUT/DELETE variants endpoints
- progress-service: lab_grades table, POST/GET /api/v1/grades, GET /me/grades
- gateway: routes for /api/v1/assign and /api/v1/grades
- web: lab edit page (metadata + per-variant forms + add/delete variant)
- web: group page shows grades matrix per lab with editable score inputs
  and computed average column
- web: student dashboard renders statement via markdown, shows deadline

services/gateway/src/main/resources/application.yml

@@ -20,7 +20,7 @@ spring:
             - id: progress
               uri: ${LMS_PROGRESS_URI:http://localhost:8083}
               predicates:
-                - Path=/api/v1/assign,/api/v1/assign/**,/api/v1/assignments/**,/api/v1/levels,/api/v1/levels/**,/api/v1/me/**,/api/v1/distribute,/api/v1/distribute/**
+                - Path=/api/v1/assign,/api/v1/assign/**,/api/v1/assignments/**,/api/v1/levels,/api/v1/levels/**,/api/v1/me/**,/api/v1/distribute,/api/v1/distribute/**,/api/v1/grades,/api/v1/grades/**
 
 management:
   endpoints: