refactor(nvim,zsh): remove Mason; use Home-Manager-provisioned tooling

LSPs, formatters, linters, and the lldb-dap debugger now come from
~/.nix-profile/bin (see nix/common.nix). lspconfig keeps the default
configs; we just opt-in via vim.lsp.enable() with an explicit list.

Changes:
  - dot_config/nvim/lua/plugins/lsp.lua: drop mason*, replace
    mason-lspconfig handler with explicit vim.lsp.enable({...}); drop
    groovy/jenkins formatters and lint entries; drop systemd lint
    (nginx + groovy + systemdlint tools dropped per plan).
  - dot_config/nvim/lua/plugins/debug.lua: drop mason-nvim-dap; drop
    codelldb adapter; switch dap.configurations.cpp to type='lldb'
    (lldb-dap is the upstream successor, ships with pkgs.lldb).
  - dot_config/nvim/init.lua: remove mason.nvim, mason-lspconfig.nvim,
    mason-tool-installer.nvim, mason-nvim-dap.nvim from vim.pack.add.
  - dot_config/nvim/lua/config/update.lua: remove MasonToolsUpdateSync.
  - dot_config/zsh/dot_zshrc: flip plugin source order — prefer
    ~/.nix-profile/share, fall back to /usr/share/zsh (was the other
    way around).
  - nix/bootstrap.sh: drop the uv-python3.11 step (no longer needed
    once Mason no longer source-builds Python LSPs on Ubuntu 20.04).

Phase 6 of the nix-on-host migration plan.

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