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

furt-lua/config/server.lua

@@ -1,88 +0,0 @@
--- furt-lua/config/server.lua
--- Server configuration for Furt Lua HTTP-Server
-
-return {
-    -- HTTP Server settings
-    host = "127.0.0.1",
-    port = 8080,
-    
-    -- Timeouts (seconds)
-    client_timeout = 10,
-    
-    -- CORS Configuration
-    cors = {
-        -- Default allowed origins for development
-        -- Override in production with CORS_ALLOWED_ORIGINS environment variable
-        allowed_origins = (function()
-            local env_origins = os.getenv("CORS_ALLOWED_ORIGINS")
-            if env_origins then
-                -- Parse comma-separated list from environment
-                local origins = {}
-                for origin in env_origins:gmatch("([^,]+)") do
-                    table.insert(origins, origin:match("^%s*(.-)%s*$")) -- trim whitespace
-                end
-                return origins
-            else
-                -- Default development origins
-                return {
-                    "http://localhost:1313",      -- Hugo dev server
-                    "http://127.0.0.1:1313",     -- Hugo dev server alternative
-                    "http://localhost:3000",     -- Common dev port
-                    "http://127.0.0.1:3000"      -- Common dev port alternative
-                }
-            end
-        end)()
-    },
-    
-    -- Logging
-    log_level = "info",
-    log_requests = true,
-    
-    -- API-Key-Authentifizierung (PRODUCTION READY)
-    api_keys = {
-        -- Hugo Frontend API-Key (für Website-Formulare)
-        [os.getenv("HUGO_API_KEY") or "hugo-dev-key-change-in-production"] = {
-            name = "Hugo Frontend",
-            permissions = {"mail:send"},
-            allowed_ips = {
-                "127.0.0.1",           -- Localhost
-                "10.0.0.0/8",          -- Private network
-                "192.168.0.0/16",      -- Private network  
-                "172.16.0.0/12"        -- Private network
-            }
-        },
-        
-        -- Admin API-Key (für Testing und Management)
-        [os.getenv("ADMIN_API_KEY") or "admin-dev-key-change-in-production"] = {
-            name = "Admin Access",
-            permissions = {"*"},  -- All permissions
-            allowed_ips = {
-                "127.0.0.1",           -- Local only for admin
-                "10.0.0.0/8"           -- Internal network
-            }
-        },
-        
-        -- Optional: Monitoring API-Key (nur Health-Checks)
-        [os.getenv("MONITORING_API_KEY") or "monitoring-dev-key"] = {
-            name = "Monitoring Service",
-            permissions = {"monitoring:health"},
-            allowed_ips = {
-                "127.0.0.1",
-                "10.0.0.0/8",
-                "172.16.0.0/12"
-            }
-        }
-    },
-    
-    -- Mail configuration (for SMTP integration)
-    mail = {
-        smtp_server = os.getenv("SMTP_HOST") or "mail.dragons-at-work.de",
-        smtp_port = tonumber(os.getenv("SMTP_PORT")) or 465,
-        use_ssl = true,
-        username = os.getenv("SMTP_USERNAME"),
-        password = os.getenv("SMTP_PASSWORD"),
-        from_address = os.getenv("SMTP_FROM") or "noreply@dragons-at-work.de",
-        to_address = os.getenv("SMTP_TO") or "michael@dragons-at-work.de"
-    }
-}
-