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

.gitignore

@@ -1,37 +1,16 @@
 # Environment variables (NEVER commit!)
 .env
 
-# Go build artifacts
-*.exe
-*.exe~
-*.dll
-*.so
-*.dylib
-furt-gateway
-formular2mail-service
-sagjan-service
-/build/
-/dist/
-
-# Go test files
-*.test
-*.out
-coverage.txt
-coverage.html
-
-# Go modules
-/vendor/
-
 # Lua specific
 *.luac
 .luarocks/
 luarocks.lock
 
-# Furt-lua runtime/build artifacts
-furt-lua/bin/
-furt-lua/logs/
-furt-lua/tmp/
-furt-lua/pid/
+# Furt runtime/build artifacts
+bin/
+logs/
+tmp/
+pid/
 
 # Issue creation scripts (these create issues, don't version them)
 scripts/gitea-issues/
@@ -74,8 +53,6 @@ debug.log
 *.sqlite3
 
 # Configuration files with secrets
-config.local.yaml
-config.production.yaml
-furt-lua/config/local.lua
-furt-lua/config/production.lua
+config.local.lua
+config.production.lua