21c08911dffc0a8a50ff6162a76f5c7a9aa8d5fe
bootstrap: tracing-subscriber with RUST_LOG env filter, ServerConfig from env vars (KFRAME_DATABASE_URL, KFRAME_TCP_ADDR, etc.), dotenvy for .env file loading. Replaced all println with tracing macros. tcp-server: replaced println with tracing::info/warn. Added .env.example and .gitignore for db files.
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