fix: code quality, memory safety, and install improvements
Critical fixes: - Fix Dockerfile: reorder stages so frontend assets embed into Go binary - Fix Go version 1.25 (nonexistent) to 1.24 across Dockerfile, go.mod, CI - Add graceful game server shutdown on SIGTERM/SIGINT - Order startup tasks: updates complete before auto-start - Fix TOCTOU race in UpdateSettings with atomic Update() method Security: - Add optional AUTH_TOKEN bearer auth middleware on API/WS routes - Fix path traversal in DeleteMod using filepath.Rel instead of HasPrefix - Add input validation for IPPort, ServerParameters, ScheduledUpdate Memory safety: - Cap RPT buffer allocation to 64KB to prevent OOM on large logs - Cap GetLog file read to 10MB - Fix context cancel leak in SteamCmdManager.run() - Remove data-raced cancel field in steamcmd.go - Atomic file writes (write-temp-then-rename) across all managers Reliability: - Log save errors in ProcessManager.Stop() - Atomic file writes prevent corruption on crash Tests: - Add mod_manager_test.go (12 tests: ListWorkshopMods, ListLocalMods, BuildUsageMap, RemoveMod, dirSize) - Add scheduler_test.go (6 tests: Start/Stop, Refresh with empty, invalid, valid, and replaced cron expressions) - Add TestRestart to server_process_test.go CI/Docs: - Add -race flag to go test in CI and Makefile - Add npm lint step to CI - Add Go/npm module caching to CI - Update README: prerequisites, AUTH_TOKEN/GIN_MODE/SERVERS_DIR docs, fix manual quickstart to use make build
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