chore: initial commit for v0.0.1

DChain single-node blockchain + React Native messenger client.

Core:
- PBFT consensus with multi-sig validator admission + equivocation slashing
- BadgerDB + schema migration scaffold (CurrentSchemaVersion=0)
- libp2p gossipsub (tx/v1, blocks/v1, relay/v1, version/v1)
- Native Go contracts (username_registry) alongside WASM (wazero)
- WebSocket gateway with topic-based fanout + Ed25519-nonce auth
- Relay mailbox with NaCl envelope encryption (X25519 + Ed25519)
- Prometheus /metrics, per-IP rate limit, body-size cap

Deployment:
- Single-node compose (deploy/single/) with Caddy TLS + optional Prometheus
- 3-node dev compose (docker-compose.yml) with mocked internet topology
- 3-validator prod compose (deploy/prod/) for federation
- Auto-update from Gitea via /api/update-check + systemd timer
- Build-time version injection (ldflags → node --version)
- UI / Swagger toggle flags (DCHAIN_DISABLE_UI, DCHAIN_DISABLE_SWAGGER)

Client (client-app/):
- Expo / React Native / NativeWind
- E2E NaCl encryption, typing indicator, contact requests
- Auto-discovery of canonical contracts, chain_id aware, WS reconnect on node switch

Documentation:
- README.md, CHANGELOG.md, CONTEXT.md
- deploy/single/README.md with 6 operator scenarios
- deploy/UPDATE_STRATEGY.md with 4-layer forward-compat design
- docs/contracts/*.md per contract

Makefile

@@ -0,0 +1,94 @@
+.PHONY: build test up down reset deploy logs logs-node1 logs-node2 logs-node3 \
+        status peer-ids rebuild docker-clean test-local
+
+# ── Сборка ───────────────────────────────────────────────────────────────────
+
+build:
+	go build -o bin/node$(EXE)   ./cmd/node
+	go build -o bin/client$(EXE) ./cmd/client
+	go build -o bin/wallet$(EXE) ./cmd/wallet
+	go build -o bin/peerid$(EXE) ./cmd/peerid
+
+test:
+	go test ./...
+
+# ── Docker: запуск / остановка ───────────────────────────────────────────────
+
+## Собрать образ и запустить все три ноды
+up:
+	docker compose up --build -d
+	@printf "\n  Explorer  →  http://localhost:8081\n"
+	@printf "  node2     →  http://localhost:8082\n"
+	@printf "  node3     →  http://localhost:8083\n\n"
+	@printf "  Задеплоить контракты: make deploy\n\n"
+
+## Остановить ноды (данные сохраняются)
+down:
+	docker compose down
+
+## Полный сброс: остановить + удалить тома с данными
+reset:
+	docker compose down -v
+	@printf "\n  Данные удалены. Запустите 'make up' для чистого старта.\n\n"
+
+## Задеплоить 4 production-контракта
+deploy:
+	docker compose --profile deploy run --rm deploy
+
+# ── Логи ─────────────────────────────────────────────────────────────────────
+
+logs:
+	docker compose logs -f
+
+logs-node1:
+	docker compose logs -f node1
+
+logs-node2:
+	docker compose logs -f node2
+
+logs-node3:
+	docker compose logs -f node3
+
+# ── Статус ───────────────────────────────────────────────────────────────────
+
+status:
+	@printf "\n── Контейнеры ──────────────────────────────────────────\n"
+	docker compose ps
+	@printf "\n── Сети ────────────────────────────────────────────────\n"
+	docker network ls | grep dchain || true
+	@printf "\n── Backbone IP-адреса ──────────────────────────────────\n"
+	@docker inspect -f '{{.Name}}  {{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' \
+		node1 node2 node3 2>/dev/null | grep 172.30 || true
+	@printf "\n"
+
+# ── Peer IDs ─────────────────────────────────────────────────────────────────
+
+## Показать peer ID и backbone multiaddr для всех нод
+peer-ids: build
+	@printf "\n── node1 ────────────────────────────────────────────────\n"
+	bin/peerid$(EXE) --key testdata/node1.json --ip 172.30.0.11 --port 4001
+	@printf "\n── node2 ────────────────────────────────────────────────\n"
+	bin/peerid$(EXE) --key testdata/node2.json --ip 172.30.0.12 --port 4001
+	@printf "\n── node3 ────────────────────────────────────────────────\n"
+	bin/peerid$(EXE) --key testdata/node3.json --ip 172.30.0.13 --port 4001
+	@printf "\n"
+
+# ── Docker: служебные ────────────────────────────────────────────────────────
+
+rebuild:
+	docker compose build --no-cache
+	docker compose up -d
+
+docker-clean:
+	docker compose down -v --rmi local
+
+# ── Локальный тест (одна нода) ────────────────────────────────────────────────
+
+test-local: build
+	@rm -rf /tmp/testchain
+	MSYS_NO_PATHCONV=1 bin/node$(EXE) \
+		--genesis --db /tmp/testchain --key testdata/node1.json \
+		--listen /ip4/0.0.0.0/tcp/4001 &
+	@sleep 8 && kill $$(pgrep -f "bin/node") 2>/dev/null || true
+	@echo "--- chain info ---"
+	bin/client$(EXE) info --db /tmp/testchain