feat(nvim): integrate CodeCompanion with LlamaSwap and Copilot

- Remove old code-companion-config.lua file
- Move LLM configuration to llm.lua with LlamaSwap and Copilot integration
- Add copilot-vim plugin to default.nix
- Update which-key bindings to include new CodeCompanion commands
- Configure CodeCompanion with chat, inline, and command strategies using LlamaSwap adapter
- Add memory configuration with default project files
- Update LSP configuration for CodeCompanion markdown rendering

modules/home/programs/terminal/nvim/config/lua/which-key-config.lua

@@ -7,7 +7,8 @@ wk.add({
 	{ "K",          desc = "Definition Hover" },
 	{ "<leader>a",  desc = "Aerial" },
 	{ "<leader>c",  desc = "CodeCompanion" },
-	{ "<leader>cc", "<cmd>CodeCompanionChat Toggle<cr>",                 desc = "Toggle Chat" },
+	{ "<leader>cn", "<cmd>CodeCompanionChat<cr>",                        desc = "New Chat",           mode = { "v", "n" } },
+	{ "<leader>ct", "<cmd>CodeCompanionChat Toggle<cr>",                 desc = "Toggle Chat" },
 	{ "<leader>ci", "<cmd>CodeCompanion<cr>",                            desc = "Inline Prompt",      mode = "v" },
 	{ "<leader>db", desc = "Toggle Breakpoint" },
 	{ "<leader>dc", desc = "Continue" },