chore: migrate deps to namespace syntax (mcpp 0.0.6)

Updates mcpp.toml to use explicit namespace fields:
- [package].namespace added
- [package].name uses short name only
- [dependencies.compat] / [dev-dependencies.compat] for non-modular libs
- [dependencies.mcpplibs.capi] for C API wrappers

Author: Sunrisepeak

mcpp.toml

@@ -1,25 +1,19 @@
 [package]
-name        = "mcpplibs.capi.lua"
+namespace   = "mcpplibs.capi"
+name        = "lua"
 version     = "0.0.3"
-description = "C++23 module wrapping the Lua 5.4 C API — `import mcpplibs.capi.lua;`"
+description = "C++23 module wrapping the Lua 5.4 C API — import mcpplibs.capi.lua;"
 license     = "Apache-2.0"
 repo        = "https://github.com/mcpplibs/lua"
 
 [lib]
-# The primary module interface lives at `src/capi/lua.cppm`. The default
-# convention would look at `src/lua.cppm` (last segment of the package
-# name), so override explicitly.
 path = "src/capi/lua.cppm"
 
 [targets.capi-lua]
 kind = "lib"
 
-# `lua` is the upstream Lua 5.4 C library shipped via mcpp-index. mcpp
-# 0.0.3 propagates its headers (lua.h / lauxlib.h / lualib.h) into our
-# compile rule via the transitive include-dir walk.
-[dependencies]
+[dependencies.compat]
 lua = "5.4.7"
 
-# `mcpp test` discovers tests/main.cpp automatically.
-[dev-dependencies]
+[dev-dependencies.compat]
 gtest = "1.15.2"