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/git-config.lua

@@ -0,0 +1,69 @@
+require("gitsigns").setup({
+	current_line_blame = true,
+	current_line_blame_opts = { delay = 0 },
+	on_attach = function(bufnr)
+		local gitsigns = require("gitsigns")
+
+		local function map(mode, l, r, opts)
+			opts = opts or {}
+			opts.buffer = bufnr
+			vim.keymap.set(mode, l, r, opts)
+		end
+
+		map("n", "<leader>gb", gitsigns.toggle_current_line_blame, { desc = "Git Blame Line" })
+		map("n", "<leader>gB", function()
+			gitsigns.blame_line({ full = true })
+		end, { desc = "Git Blame Full" })
+	end,
+})
+
+
+local function get_git_info()
+	local abs_path = vim.fn.expand("%:p")
+	local git_root = vim.fn.systemlist(
+		"git -C " .. vim.fn.escape(vim.fn.fnamemodify(abs_path, ":h"), " ") .. " rev-parse --show-toplevel"
+	)[1]
+
+	if vim.v.shell_error ~= 0 then
+		return
+	end
+
+	local git_repo = vim.fn.system("git remote get-url origin"):match("([^/:]+/[^/.]+)%.?[^/]*$"):gsub("\n", "")
+	local git_branch = vim.fn.system("git rev-parse --abbrev-ref HEAD"):gsub("\n", "")
+
+	return {
+		file = vim.fn.fnamemodify(abs_path, ":s?" .. git_root .. "/??"),
+		branch = git_branch,
+		repo = git_repo,
+	}
+end
+
+local function copy_git_link()
+	local git_info = get_git_info()
+	if git_info == nil then
+		vim.notify("Failed to get git info", vim.log.levels.ERROR)
+		return
+	end
+
+	local start_line = vim.fn.line("v")
+	local end_line = vim.fn.line(".")
+
+	local message = string.format(
+		"https://github.com/%s/blob/%s/%s#L%d-L%d",
+		git_info.repo,
+		git_info.branch,
+		git_info.file,
+		start_line,
+		end_line
+	)
+	vim.fn.setreg("+", message)
+	vim.notify("Copied:\n\t" .. message, vim.log.levels.INFO)
+end
+
+-- Create KeyMaps
+vim.keymap.set("v", "<Leader>gy", function() copy_git_link() end, { desc = "Copy GitHub Link" })
+vim.keymap.set('n', '<leader>go', '<cmd>DiffviewOpen<CR>', { desc = "Open Diff - Current" })
+vim.keymap.set('n', '<leader>gO', '<cmd>DiffviewOpen origin/main...HEAD<CR>', { desc = "Open Diff - Main" })
+vim.keymap.set('n', '<leader>gh', '<cmd>DiffviewFileHistory<CR>', { desc = "Diff History" })
+vim.keymap.set('n', '<leader>gH', '<cmd>DiffviewFileHistory --range=origin..HEAD<CR>', { desc = "Diff History - Main" })
+vim.keymap.set('n', '<leader>gc', '<cmd>DiffviewClose<CR>', { desc = "Close Diff" })