Build: enable ktlint+detekt, format sources, add core unit tests

config/detekt/detekt.yml

@@ -0,0 +1,50 @@
+# Конфигурация detekt для LMS. Значения подобраны под текущий стиль кода:
+# базовые правила включены (buildUponDefaultConfig = true), шумные отключены или ослаблены.
+build:
+  maxIssues: 0
+  weights: {}
+
+config:
+  validation: true
+  warningsAsErrors: false
+
+complexity:
+  LongMethod:
+    threshold: 60
+  LongParameterList:
+    functionThreshold: 6
+    constructorThreshold: 7
+    ignoreDefaultParameters: true
+  TooManyFunctions:
+    thresholdInFiles: 20
+    thresholdInClasses: 20
+    thresholdInInterfaces: 20
+    thresholdInObjects: 20
+    thresholdInEnums: 20
+  ComplexCondition:
+    threshold: 4
+
+style:
+  MagicNumber:
+    active: false
+  MaxLineLength:
+    active: false
+  ReturnCount:
+    max: 4
+  WildcardImport:
+    active: true
+  UnusedPrivateMember:
+    active: true
+  LoopWithTooManyJumpStatements:
+    maxJumpCount: 2
+
+naming:
+  FunctionNaming:
+    ignoreAnnotated:
+      - 'Test'
+  MatchingDeclarationName:
+    active: false
+
+empty-blocks:
+  EmptyCatchBlock:
+    allowedExceptionNameRegex: 'ignored|expected|_'