refactor(nvim): 完整重写配置，支持 Go/Rust/Python/TypeScript 开发

- 架构重构：新增 plugins/lang/ 子目录，按语言拆分配置
- 补全引擎：nvim-cmp → blink.cmp + LuaSnip
- 文件浏览：新增 neo-tree（<Space>e）
- 语言支持：
  - Go: ray-x/go.nvim + dap-go + neotest-go
  - Rust: rustaceanvim + crates.nvim
  - Python: venv-selector + dap-python + neotest-python
  - TypeScript: typescript-tools.nvim（替换 ts_ls）
- LSP: lazydev + mason + mason-lspconfig + fidget + inc-rename
- 格式化: conform.nvim（lsp_format fallback，保存时自动格式化）
- Lint: nvim-lint（selene 替换 luacheck，Mason 可直接安装）
- UI: snacks.nvim（dashboard+notifier+picker）+ noice + lualine + bufferline
- 编辑增强: mini.ai + mini.surround + grug-far + flash + ufo + trouble v3
- 删除废弃文件: cmp/coding/null-ls/mason/lspconfig/go/python 等旧文件
- 修复: Neovim 0.12 treesitter query 校验报错（noice routes 过滤）
- 新增: NVIM_GUIDE.md 快捷键使用手册

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

nvim/lua/plugins/lang/go.lua

@@ -0,0 +1,121 @@
+-- lang/go.lua - Go 开发专用配置
+
+return {
+  -- ray-x/go.nvim - Go 全功能插件
+  {
+    "ray-x/go.nvim",
+    dependencies = {
+      "ray-x/guihua.lua",
+      "neovim/nvim-lspconfig",
+      "nvim-treesitter/nvim-treesitter",
+    },
+    ft = { "go", "gomod", "gowork", "gotmpl" },
+    build = ':lua require("go.install").update_all_sync()',
+    opts = {
+      lsp_cfg = false, -- LSP 由 lsp.lua 的 gopls 配置统一管理
+      lsp_keymaps = false,
+      lsp_codelens = true,
+      lsp_inlay_hints = {
+        enable = true,
+        only_current_line = false,
+        show_parameter_hints = true,
+        parameter_hints_prefix = " ",
+        other_hints_prefix = " ",
+      },
+      formatter = "gofumpt",
+      goimport = "gopls",
+      gofmt = true,
+      test_runner = "go",
+      run_in_floaterm = true,
+      dap_debug = true,
+      dap_debug_gui = true,
+      dap_debug_vt = true,
+      textobjects = true,
+      trouble = true,
+      diagnostic = {
+        hdlr = true,
+        underline = true,
+        virtual_text = { space = 0, prefix = "" },
+        signs = true,
+        update_in_insert = false,
+      },
+      tag_transform = "snakecase",
+      verbose = false,
+    },
+    config = function(_, opts)
+      require("go").setup(opts)
+
+      local gogroup = vim.api.nvim_create_augroup("GoGroup", { clear = true })
+
+      vim.api.nvim_create_autocmd("BufWritePre", {
+        pattern = "*.go",
+        group = gogroup,
+        callback = function()
+          require("go.format").goimport()
+        end,
+      })
+    end,
+    keys = {
+      { "<leader>gts", "<cmd>GoAlt<cr>", ft = "go", desc = "切换测试/实现" },
+      { "<leader>gtt", "<cmd>GoTest<cr>", ft = "go", desc = "运行测试" },
+      { "<leader>gtf", "<cmd>GoTestFunc<cr>", ft = "go", desc = "测试当前函数" },
+      { "<leader>gtc", "<cmd>GoCoverage<cr>", ft = "go", desc = "测试覆盖率" },
+      { "<leader>gtC", "<cmd>GoCoverageClear<cr>", ft = "go", desc = "清除覆盖率" },
+      { "<leader>gge", "<cmd>GoIfErr<cr>", ft = "go", desc = "生成错误处理" },
+      { "<leader>ggf", "<cmd>GoFillStruct<cr>", ft = "go", desc = "填充结构体" },
+      { "<leader>ggs", "<cmd>GoFillSwitch<cr>", ft = "go", desc = "填充 switch" },
+      { "<leader>gta", "<cmd>GoAddTag<cr>", ft = "go", desc = "添加标签" },
+      { "<leader>gtr", "<cmd>GoRmTag<cr>", ft = "go", desc = "移除标签" },
+      { "<leader>gr",  "<cmd>GoRun<cr>", ft = "go", desc = "运行" },
+      { "<leader>gb",  "<cmd>GoBuild<cr>", ft = "go", desc = "构建" },
+      { "<leader>gi",  "<cmd>GoImpl<cr>", ft = "go", desc = "实现接口" },
+      { "<leader>gdc", "<cmd>GoDoc<cr>", ft = "go", desc = "查看文档" },
+      { "<leader>gv",  "<cmd>GoVet<cr>", ft = "go", desc = "go vet" },
+    },
+  },
+
+  -- Go DAP 支持
+  {
+    "leoluz/nvim-dap-go",
+    ft = "go",
+    dependencies = { "mfussenegger/nvim-dap" },
+    config = function()
+      require("dap-go").setup({ dap_configurations = {
+        { type = "go", name = "调试文件", request = "launch", program = "${file}" },
+        { type = "go", name = "调试包", request = "launch", program = "${fileDirname}" },
+        { type = "go", name = "调试测试", request = "launch", mode = "test", program = "${file}" },
+      }})
+    end,
+    keys = {
+      { "<leader>dtg", function() require("dap-go").debug_test() end, ft = "go", desc = "调试当前测试" },
+      { "<leader>dtl", function() require("dap-go").debug_last_test() end, ft = "go", desc = "调试上次测试" },
+    },
+  },
+
+  -- neotest Go 适配器
+  {
+    "nvim-neotest/neotest",
+    optional = true,
+    dependencies = { "nvim-neotest/neotest-go" },
+    opts = {
+      adapters = {
+        ["neotest-go"] = {
+          args = { "-count=1", "-timeout=30s", "-v" },
+        },
+      },
+    },
+  },
+
+  -- Mason Go 工具
+  {
+    "williamboman/mason.nvim",
+    optional = true,
+    opts = function(_, opts)
+      opts.ensure_installed = opts.ensure_installed or {}
+      vim.list_extend(opts.ensure_installed, {
+        "gopls", "gofumpt", "goimports", "golangci-lint",
+        "gomodifytags", "gotests", "impl", "delve",
+      })
+    end,
+  },
+}