feat(v1.1.0): major refactor with modular architecture and plugin support

- Add config.lua for comprehensive configuration options
  (transparent, italic_comments, bold_keywords, bold_functions, bold_types, terminal_colors)
- Add highlights.lua with 500+ highlight groups for 30+ plugins
  (Telescope, NvimTree, Neo-tree, GitSigns, nvim-cmp, Lazy.nvim, Mason, etc.)
- Add colors/ directory for :colorscheme command support
- Add terminal colors (16-color palette for :terminal)
- Add test suite (test/test_colors.lua)
- Add development tools (selene.toml, stylua.toml, vim.toml)
- Add CHANGELOG.md following Keep a Changelog format

- Fix colors.lua not being used by init.lua
- Fix setup(opts) not applying configuration options
- Fix README referencing non-existent files

- Update documentation with accurate file structure and API docs

colors/cargdev-cyberpunk.lua

@@ -0,0 +1,4 @@
+-- CargDev-Cyberpunk colorscheme
+-- Load with: colorscheme cargdev-cyberpunk
+
+require("cargdev-cyberpunk").load()