rework keymaps and plugin config

- Change leader from space to comma
- Move opencode keymaps into plugin config
- Move picker keymaps from <leader>p to <leader>f
- Change buffer delete mapping from bd to bk
- Add DAP debugging keymaps and dap-view
- Remove zk-nvim, checkmate plugins
- Add claude-code, conjure, scnvim plugins
- Update LSP servers: replace basedpyright with ty, add gopls/clojure_lsp/harper_ls/tinymist
- Enable inlay hints on LspAttach
- Enable go/sql/typst tree-sitter
- Add htmlhint formatter
- Configure opencode with snacks terminal

plugin/10_options.lua

@@ -16,7 +16,7 @@
 -- reading. Consider preserving this or remove `-- stylua` lines to autoformat.
 
 -- General ====================================================================
-vim.g.mapleader = ' ' -- Use `<Space>` as <Leader> key
+vim.g.mapleader = ',' -- Use comma as <Leader> key
 
 vim.o.mouse       = 'a'            -- Enable mouse
 vim.o.mousescroll = 'ver:25,hor:6' -- Customize mouse scroll