feat(nvim): reorganize and modernize Neovim configuration

- Remove deprecated config files: git-ref.lua, git-signs.lua, diffview-config.lua, lsp-lines-config.lua, neotree-config.lua, fidget-spinner.lua, silicon-config.lua, telescope-config.lua, llm.lua
- Add new configuration files: diagnostics-config.lua, git-config.lua, llm-config.lua, snacks-config.lua
- Update existing config files: base.lua, dap-config.lua, init.lua, lsp-config.lua, lualine-config.lua, noice-config.lua, octo-config.lua, toggleterm-config.lua, which-key-config.lua
- Update nvim and opencode module configurations

modules/home/programs/terminal/nvim/config/lua/lualine-config.lua

@@ -50,5 +50,8 @@ end
 
 require("lualine").setup({
 	options = { theme = "catppuccin" },
-	sections = { lualine_c = { { pr_status } } },
+	sections = {
+		lualine_c = { { pr_status } },
+		lualine_z = { require("opencode").statusline }
+	},
 })