feat: add plagiarism graph, domain API services, error/empty-state handling, and UI polish

- Add PlagiarismGraphComponent (force-graph) with legend, abbreviated names,
  risk-derived node colors, and particle animation; integrated into work, event,
  group, and student detail pages
- Extract domain API services (students, events, groups, reference-sets, users,
  analysis-runs, audit) from WorksApiService
- Add RiskLevelPipe for translating risk level values to Russian
- Replace raw IDs with entity names across all detail page overview sections
- Dashboard: remove Works tab, reorder tabs (Students, Events, Groups, Ref-sets),
  hide list cards when empty or on error
- Hide secondary blocks (runs, matches, graph, analytics) on error instead of
  showing error text; keep top-level entity load errors visible
- Refset detail: split Ingestions tab into separate list and upload cards;
  hide list card when empty or on error
- Convert analysis runs list to table; fix kv-grid vertical alignment
- Style native select[tuiSelect] to match other form fields
- Add favicon (yellow star) from sparkguardian
- Add CLAUDE.md, .env.example, proxy config, CI workflow, and Makefile

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Makefile

@@ -0,0 +1,44 @@
+.DEFAULT_GOAL := help
+
+.PHONY: help install env-sync start serve build build-dev watch test lint clean
+
+help:
+	@echo "SparkAntiplagiat"
+	@echo "  make install     Установить зависимости (npm install)"
+	@echo "  make env-sync    Сгенерировать src/environments/environment.ts из .env"
+	@echo "  make start       Dev-сервер (ng serve + прокси, перед стартом — env:sync)"
+	@echo "  make serve       то же, что start"
+	@echo "  make build       Production-сборка (перед сборкой — env:sync)"
+	@echo "  make build-dev   Сборка в режиме development"
+	@echo "  make watch       ng build --watch (development)"
+	@echo "  make test        Unit-тесты (ng test)"
+	@echo "  make lint        ESLint по всему проекту"
+	@echo "  make clean       Удалить dist, out-tsc, кэш Angular"
+
+install:
+	npm install
+
+env-sync:
+	npm run env:sync
+
+start serve:
+	npm start
+
+build:
+	npm run build
+
+build-dev:
+	npm run env:sync
+	npx ng build --configuration development
+
+watch:
+	npm run watch
+
+test:
+	npm test
+
+lint:
+	npm run lint
+
+clean:
+	rm -rf dist out-tsc .angular/cache