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/rust.lua

@@ -0,0 +1,111 @@
+-- lang/rust.lua - Rust 开发专用配置（rustaceanvim + codelldb）
+
+return {
+  -- rustaceanvim - Rust 全功能插件（接管 rust-analyzer LSP）
+  {
+    "mrcjkb/rustaceanvim",
+    version = "^5",
+    ft = "rust",
+    opts = {
+      server = {
+        on_attach = function(_, bufnr)
+          local map = function(mode, lhs, rhs, desc)
+            vim.keymap.set(mode, lhs, rhs, { buffer = bufnr, silent = true, desc = desc })
+          end
+          -- Rust 专用操作
+          map("n", "<leader>rr", function() vim.cmd.RustLsp("runnables") end, "Rust 运行目标")
+          map("n", "<leader>rt", function() vim.cmd.RustLsp("testables") end, "Rust 测试目标")
+          map("n", "<leader>rd", function() vim.cmd.RustLsp("debuggables") end, "Rust 调试目标")
+          map("n", "<leader>re", function() vim.cmd.RustLsp("explainError") end, "解释错误")
+          map("n", "<leader>rc", function() vim.cmd.RustLsp("openCargo") end, "打开 Cargo.toml")
+          map("n", "<leader>rp", function() vim.cmd.RustLsp("parentModule") end, "父模块")
+          map("n", "<leader>rm", function() vim.cmd.RustLsp("expandMacro") end, "展开宏")
+          map("n", "<leader>rx", function() vim.cmd.RustLsp("externalDocs") end, "外部文档")
+          map("n", "K", function() vim.cmd.RustLsp({ "hover", "actions" }) end, "悬浮操作")
+          map("n", "<leader>ca", function() vim.cmd.RustLsp("codeAction") end, "代码操作")
+        end,
+        default_settings = {
+          ["rust-analyzer"] = {
+            cargo = {
+              allFeatures = true,
+              loadOutDirsFromCheck = true,
+              runBuildScripts = true,
+            },
+            checkOnSave = {
+              allFeatures = true,
+              command = "clippy",
+              extraArgs = { "--no-deps" },
+            },
+            procMacro = {
+              enable = true,
+              ignored = {
+                ["async-trait"] = { "async_trait" },
+                ["napi-derive"] = { "napi" },
+                ["async-recursion"] = { "async_recursion" },
+              },
+            },
+            inlayHints = {
+              bindingModeHints = { enable = false },
+              chainingHints = { enable = true },
+              closingBraceHints = { enable = true, minLines = 25 },
+              closureReturnTypeHints = { enable = "never" },
+              lifetimeElisionHints = { enable = "never" },
+              parameterHints = { enable = false },
+              typeHints = { enable = true, hideClosureInitialization = false, hideNamedConstructor = false },
+            },
+          },
+        },
+      },
+      -- DAP 配置（codelldb）
+      dap = {},
+    },
+    config = function(_, opts)
+      -- 延迟设置 DAP adapter（需在 rustaceanvim 加载后才能 require）
+      local ok_mason, mason_registry = pcall(require, "mason-registry")
+      if ok_mason and mason_registry.is_installed("codelldb") then
+        local codelldb_path = mason_registry.get_package("codelldb"):get_install_path()
+        local codelldb = codelldb_path .. "/codelldb"
+        local liblldb = codelldb_path .. "/extension/lldb/lib/liblldb.dylib"
+        if vim.fn.has("linux") == 1 then
+          liblldb = codelldb_path .. "/extension/lldb/lib/liblldb.so"
+        end
+        opts.dap = opts.dap or {}
+        opts.dap.adapter = require("rustaceanvim.config").get_codelldb_adapter(codelldb, liblldb)
+      end
+      vim.g.rustaceanvim = vim.tbl_deep_extend("keep", vim.g.rustaceanvim or {}, opts)
+    end,
+  },
+
+  -- crates.nvim - Cargo.toml 依赖管理
+  {
+    "saecki/crates.nvim",
+    event = { "BufRead Cargo.toml" },
+    opts = {
+      completion = {
+        cmp = { enabled = false },
+        crates = { enabled = true, max_results = 8, min_chars = 3 },
+      },
+      lsp = {
+        enabled = true,
+        on_attach = function() end,
+        actions = true,
+        completion = true,
+        hover = true,
+      },
+    },
+    keys = {
+      { "<leader>rcu", function() require("crates").upgrade_all_crates() end, ft = "toml", desc = "升级所有依赖" },
+      { "<leader>rco", function() require("crates").show_popup() end, ft = "toml", desc = "Crate 信息" },
+    },
+  },
+
+  -- Mason Rust 工具
+  {
+    "williamboman/mason.nvim",
+    optional = true,
+    opts = function(_, opts)
+      opts.ensure_installed = opts.ensure_installed or {}
+      vim.list_extend(opts.ensure_installed, { "codelldb" })
+    end,
+  },
+}