fix: add missing clap attribute to no_content_indexing (#754)

[gustav-fff]

Closes #754

Root cause

crates/fff-mcp/src/main.rs:134 declared the no_content_indexing: bool field without an #[arg(long = ...)] attribute. clap therefore treated it as a positional argument with a SetTrue action, which is invalid.

Fix

Added #[arg(long = "no-content-indexing")] to the field, matching the adjacent --no-warmup / --no-watch flags.

Steps to reproduce

On pre-fix origin/main (b6f351d):

cargo run -p fff-mcp -- --help

Expected: help text listing a --no-content-indexing boolean option.

Actual (debug build): panic before any output —

thread 'main' panicked at clap_builder-4.6.0/src/builder/debug_asserts.rs:746:9:
Argument 'no_content_indexing' is positional and it must take a value but action is SetTrue

Release builds instead expose [NO_CONTENT_INDEXING] as a positional and reject --no-content-indexing.

How verified

cargo run -p fff-mcp -- --help

Now exits 0 and lists the flag:

      --no-content-indexing
          Disable the content index built after the initial scan.
          This makes grep calls slower but consumes less RAM (recommended to not turn off)

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