feat(fuzzy-finder): Add fff.nvim

lua/astrocommunity/fuzzy-finder/fff-nvim/README.md

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+# fff.nvim
+
+Fast File Finder for your AI and neovim, with memory built-in
+
+**Repository:** <https://github.com/dmtrKovalenko/fff.nvim>
+
+## Prerequisites
+
+- Neovim 0.10.0+
+- [Rustup](https://rustup.rs/) (nightly toolchain required for building the native backend)

lua/astrocommunity/fuzzy-finder/fff-nvim/init.lua

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+return {
+  "dmtrKovalenko/fff.nvim",
+  build = function() require("fff.download").download_or_build_binary() end,
+  lazy = false,
+  opts = {},
+  dependencies = {
+    {
+      "AstroNvim/astrocore",
+      opts = {
+        mappings = {
+          n = {
+            ["<Leader>ff"] = { function() require("fff").find_files() end, desc = "Find files" },
+          },
+        },
+      },
+    },
+  },
+}