feat(completion): Add vim-tabby

lua/astrocommunity/completion/tabby-nvim/README.md

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+# tabby-nvim
+
+Tabby is a self-hosted AI coding assistant that can suggest multi-line code or full functions in real-time.
+
+**Repository:** <https://github.com/TabbyML/vim-tabby>
+
+### Default Mappings
+
+| Mappings   | Action            |
+|------------|-------------------|
+| `<C-e>`    | Accept completion |
+| `Ctrl + \` | Trigger/Dismiss   |
+
+## Known Conflicts
+
+- Tabby internally utilizes the `<C-R><C-O>` command to insert the completion. If you have mapped `<C-R>` to other functions, you won't be able to accept the completion. In such scenarios, you may need to manually modify the function `tabby#Accept()` in [`autoload/tabby.vim`](https://github.com/TabbyML/tabby/tree/main/clients/vim/autoload/tabby.vim).

lua/astrocommunity/completion/tabby-nvim/init.lua

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+return {
+  "TabbyML/vim-tabby",
+  init = function()
+    vim.g.tabby_keybinding_accept = "<C-e>"
+    vim.g.tabby_keybinding_trigger_or_dismiss = "<C-\\>"
+    vim.g.tabby_node_binary = "/path/to/node"
+  end,
+}