sjg
34f6b42330
Add pickledb and dirs dependencies. Introduce BookmarkStore wrapping
PickleDb behind Arc<RwLock<>> with list/get/insert/upsert/remove ops.
Keys stored as "bm:{id}" in ~/.config/trx-rs/bookmarks.db; falls back
to ./bookmarks.db when config dir is unavailable.
Wire BookmarkStore into build_server() as actix-web app_data so all
request handlers can share the store.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>