refactor: clean repository structure for v0.1.0 open source release

- Remove Go artifacts (cmd/, internal/, pkg/, go.mod)
- Move furt-lua/* content to repository root
- Restructure as clean src/, config/, scripts/, tests/ layout
- Rewrite README.md as practical tool documentation
- Remove timeline references and marketing language
- Clean .gitignore from Go-era artifacts
- Update config/server.lua with example.org defaults
- Add .env.production to .gitignore for security

Repository now ready for open source distribution with minimal,
focused structure and generic configuration templates.
close issue DAW/furt#86

deployment/openbsd/rc.d-furt

@@ -0,0 +1,14 @@
+#!/bin/ksh
+
+daemon="/usr/local/furt/furt-lua/scripts/start.sh"
+daemon_user="_furt"
+daemon_cwd="/usr/local/furt/furt-lua"
+daemon_flags="start"
+
+. /etc/rc.d/rc.subr
+
+# pexp NACH rc.subr überschreiben (Fix für OpenBSD Issue #77)
+pexp="/usr/local/bin/lua src/main.lua.*"
+
+rc_cmd $1
+