feat: use fallback relays for bootstrapping only

- Add --relay flag to 'ngit account create' allowing users to specify
  relay URLs (repeatable). Defaults to relay-default-set when not provided.
- Remove fallback relays from fetch when repo context exists (repo
  coordinate provided). Only use them for bootstrapping (profile discovery
  with no repo context).
- Remove fallback relays from publish when repo or user relays exist.
  Only use them when neither is available (e.g. new account signup).
- Update --customize help text to reflect new relay-default-set behavior.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/lib/login/user.rs b/src/lib/login/user.rs
index 0b702ef..b273363 100644
--- a/src/lib/login/user.rs
+++ b/src/lib/login/user.rs
@@ -113,6 +113,8 @@ pub async fn get_user_details(
         }
         Ok(user_ref)
     } else {
+        // No cached profile found. Fall back to fetching from default relays
+        // (bootstrapping).
         let empty = UserRef {
             public_key: public_key.to_owned(),
             metadata: extract_user_metadata(public_key, &[])?,