Подготовить skeleton лабораторной 3 по мессенджеру

.env.example

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+# Copy to .env for your LOCAL synthetic test environment; never commit .env.
+# These are logical interface suggestions; map actual framework names in REPORT.md.
+APP_HOST=0.0.0.0
+APP_PORT=8080
+APP_ENV=lab
+SESSION_TTL_SECONDS=3600
+# Choose credentials locally. File paths contain no secret values.
+DATABASE_URL_FILE=/run/secrets/database_url
+# Optional on 3, required use on 4 in lab2; Redis OR Valkey:
+SESSION_STORE=postgres
+CACHE_URL_FILE=/run/secrets/cache_url
+API_REPLICAS=2
+IDEMPOTENCY_TTL_SECONDS=86400