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

@@ -1,26 +1,16 @@
 [package]
-name        = "mcpplibs.llmapi"
+namespace   = "mcpplibs"
+name        = "llmapi"
 version     = "0.2.5"
 description = "Modern C++ LLM API client with openai-compatible support"
 license     = "Apache-2.0"
 repo        = "https://github.com/mcpplibs/llmapi"
 
 [build]
-# `src/json/json.cppm` does `#include <json.hpp>`; expose its sibling
-# header by adding `src/json` to the include search path.
 include_dirs = ["src/json"]
 
 [targets.llmapi]
 kind = "lib"
 
-# Library convention picks `src/llmapi.cppm` automatically — that file
-# already does `export module mcpplibs.llmapi;` and re-exports every
-# partition + the third-party `mcpplibs.llmapi.nlohmann.json` module,
-# so consumers just `import mcpplibs.llmapi;`.
-#
-# mbedtls is pulled transitively through tinyhttps (which lists it as a
-# direct dep). mcpp 0.0.3's transitive walker propagates its include_dirs
-# along that chain, so we don't repeat the declaration here.
-
 [dependencies.mcpplibs]
 tinyhttps = "0.2.2"