config: parse the config once and reuse it until the file changes

Every command, status line and notification went through Config::load, which
reads *and* rewrites config.toml, so `rsp status` alone touched the file on
each call.

The daemon now keeps a parsed copy and only stats the file to notice outside
edits, so `rsp settings set` still takes effect immediately. Config::save
refreshes the cached copy too, and Config::config_path is shared by the loader
and the cache.

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