Initial commit: LMS microservices scaffold

- Gradle multi-module: libs/{common-http,security-jwt,markdown,test-support},
  services/{identity,academic,progress,gateway}, web (Thymeleaf+htmx)
- identity-service: JWT auth (RSA), accounts, students, groups, enrollment,
  import from XLSX/CSV, credentials export, password reset
- academic-service: lab import from JSON/zip (markdown + YAML + variants),
  levels, API
- progress-service: schema for student levels and variant assignments
- gateway: Spring Cloud Gateway, JWT validation, route propagation
- web: Server-side UI with flex/footer layout, light/dark theme toggle,
  admin dashboard, groups CRUD, student portal placeholder
- docker-compose: PostgreSQL 18
- Tests: identity smoke test with Testcontainers

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

@@ -0,0 +1,37 @@
+server:
+  port: ${SERVER_PORT:8080}
+
+spring:
+  application:
+    name: gateway
+  cloud:
+    gateway:
+      server:
+        webflux:
+          routes:
+            - id: identity
+              uri: ${LMS_IDENTITY_URI:http://localhost:8081}
+              predicates:
+                - Path=/api/v1/auth/**,/api/v1/accounts/**,/api/v1/groups/**,/api/v1/students/**
+            - id: academic
+              uri: ${LMS_ACADEMIC_URI:http://localhost:8082}
+              predicates:
+                - Path=/api/v1/courses/**,/api/v1/articles/**,/api/v1/labs/**,/api/v1/assets/**
+            - id: progress
+              uri: ${LMS_PROGRESS_URI:http://localhost:8083}
+              predicates:
+                - Path=/api/v1/assignments/**,/api/v1/levels/**,/api/v1/me/**,/api/v1/distribute/**
+
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health,info,gateway
+  endpoint:
+    health:
+      probes:
+        enabled: true
+
+lms:
+  jwt:
+    jwk-set-uri: ${LMS_JWT_JWK_SET_URI:http://localhost:8081/api/v1/auth/jwks.json}