initial implementation of mlua for loading plugins, see todo.md in examples

src/examples/plugins/todo.md

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+# mlua-plugin-addition todo list
+
+## implemented ("working")
+
+- [x] **cli args**  
+  `--lua-plugin` and `--lua-arg` (multiple) added with `clap`
+
+- [x] **lua scripting**  
+  `lua_plugin.rs` with `LuaRouter` userdata
+
+- [x] **file server mounting from lua**  
+  `router:add_file_server(prefix, root)` – paths relative to plugin file
+
+- [x] **route registration from lua**  
+  `router:add_static(path, status, body, content_type)`
+
+- [x] **fallback static file server**  
+  Original `resolve_fs` logic still works for non lua routes
+
+- [x] **pass cli args to lua**  
+  Accessible as `args` table inside Lua scripts.
+
+## fixing implementing needed
+
+- [ ] **better error messages from Lua**  
+    log something at all. write a custom logger ; and use logger_rs for it
+
+- [ ] **hot reload of lua plugins**  
+    i want this
+
+- [ ] **more lua api functions**  
+    very bare bones right now