Configuration template update.\n\n- Adds .env.copy alongside .env.example\n- Linux clone workflow: cp .env.copy .env, configure the Feed, then run ./run-feed-comparison.sh\n- The run script automatically downloads and verifies the matching prebuilt Release binary\n- Static binaries for Linux and macOS on x86-64 and ARM64\n- Expanded English and Chinese documentation with Website, Telegram, and Discord links