[audit] fff.nvim: remove debug/score-display flags from production config

[stanfish06]

What

Removes debug.enabled = true and show_scores = true from the vim.g.fff config table in lua/config/plugin_config.lua.

Where

lua/config/plugin_config.lua:178–184 (before this PR):

vim.g.fff = {
    lazy_sync = true,
    debug = {
        enabled = true,
        show_scores = true,
    },
}

After:

vim.g.fff = {
    lazy_sync = true,
}

Why it matters

• debug.enabled = true enables verbose logging from the fff.nvim Rust binary, writing extra output that is not useful in normal use.
• show_scores = true annotates every search result with its fuzzy-match score, cluttering the picker UI during daily file/grep navigation.
• These appear to be development leftovers; there is no comment indicating they are intentional.

Test plan

• Open <leader>ff — confirm no score annotations appear next to filenames
• Open <leader>fg — confirm grep results are clean
• Confirm no Rust panic or unexpected fff warnings in :messages

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