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/build.gradle.kts

@@ -0,0 +1,19 @@
+plugins {
+    id("lms.spring-boot")
+}
+
+dependencies {
+    implementation(platform(libs.springBootBom))
+    implementation(platform(libs.springCloudBom))
+
+    implementation(libs.springCloudStarterGatewayWebflux)
+    implementation(libs.springBootStarterActuator)
+
+    implementation(project(":libs:security-jwt"))
+
+    testImplementation(project(":libs:test-support"))
+}
+
+springBoot {
+    mainClass.set("ru.ysu.lms.gateway.GatewayApplicationKt")
+}