chore: init monorepo with GPL-3.0 license, docs, backend skeleton, frontend wiring

docs/deployment.md

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+# Деплой Indexium
+
+## MVP (один VPS, <$20/мес)
+
+### Инфра
+- **VPS**: Hetzner CX22 (2 vCPU, 4GB) или аналог.
+- **Postgres**: Supabase Free / Neon Free / или Docker на том же VPS.
+- **Redis**: Valkey/Redis в Docker.
+- **Reverse proxy**: Caddy (авто TLS) или Nginx.
+
+### Компоновка
+```
+VPS
+ ├─ Caddy :80/:443 → :3000 (Axum) + :5173 (SvelteKit SSR)
+ ├─ indexium-backend (systemd / docker)
+ ├─ indexium-frontend (adapter-node)
+ ├─ postgres:5432
+ └─ redis:6379
+```
+
+### Docker Compose (prod)
+
+```yaml
+services:
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_DB: indexium
+      POSTGRES_USER: indexium
+      POSTGRES_PASSWORD: ${DB_PASSWORD}
+    volumes: [pgdata:/var/lib/postgresql/data]
+    healthcheck: { test: ["CMD-SHELL", "pg_isready -U indexium"] }
+
+  redis:
+    image: valkey/valkey:8-alpine
+    command: ["valkey-server", "--save", ""]
+    healthcheck: { test: ["CMD", "valkey-cli", "ping"] }
+
+  backend:
+    build: ./indexium-backend
+    env_file: ./indexium-backend/.env
+    depends_on: [postgres, redis]
+    ports: ["3000:3000"]
+
+  frontend:
+    build: ./indexium-frontend
+    environment: { PUBLIC_API_URL: "https://api.indexium.example.com" }
+    ports: ["5173:3000"]
+
+volumes: { pgdata: {} }
+```
+
+### Env (backend)
+
+```
+DATABASE_URL=postgres://indexium:***@postgres:5432/indexium
+REDIS_URL=redis://redis:6379
+GITHUB_APP_ID=...
+GITHUB_APP_PRIVATE_KEY=...
+WEBHOOK_SECRET=...
+RUST_LOG=info
+```
+
+### Деплой шаги
+
+```bash
+# на VPS
+git pull origin main
+docker compose -f docker-compose.prod.yml build
+docker compose -f docker-compose.prod.yml up -d
+# миграции
+docker compose exec backend sqlx migrate run
+# проверка
+curl https://api.indexium.example.com/api/v1/health
+```
+
+### Бэкапы
+
+- Postgres: ежедневный `pg_dump` + WAL (PITR если managed).
+- Хранить 7 дней в S3/R2.
+- Тест восстановления раз в месяц.
+
+### Мониторинг (MVP минимум)
+
+- `/health` + Uptime Kuma / Hetrix.
+- Логи: `journalctl -u indexium-backend` или `docker logs`.
+- Позже: Prometheus + Grafana + Loki.
+
+### CI/CD (GitHub Actions)
+
+```yaml
+# .github/workflows/ci.yml
+on: [push, pull_request]
+jobs:
+  backend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo fmt --check
+      - run: cargo clippy -- -D warnings
+      - run: cargo test
+  frontend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v2
+      - run: bun install --cwd indexium-frontend
+      - run: bun run check --cwd indexium-frontend
+```
+
+Деплой: `on: push: branches: [main]` → SSH в VPS → `git pull && docker compose up -d` (или через Watchtower).
+
+### Масштабирование (когда >1k RPS)
+
+- Вынести Worker в отдельный сервис/реплики.
+- Postgres read-replica.
+- Redis Cluster / NATS JetStream.
+- Cloudflare перед API (кэш GET).