fix: rust 1.95.0 clippy lints and matrix-sdk 0.17 API changes

Toolchain bump surfaced new lints (derivable_impls,
unnecessary_unwrap, unnecessary_sort_by, while_let_loop,
collapsible_match, unnecessary_option_map_or_else, cmp_owned)
across bft-json-crdt and huskies-server. All fixed mechanically.

Cargo.toml: dropped the no-longer-existing `rustls-tls` matrix-sdk
feature, then chased through the 0.17 API breakage:
- Relation::Reply is now a tuple variant wrapping Reply, not a
  struct variant with `in_reply_to`
- UserIdentifier::UserIdOrLocalpart removed — use
  UserIdentifier::Matrix(MatrixUserIdentifier::new(..))
- SendMessageLikeEventResult no longer exposes event_id directly;
  it's now on the inner `response` field

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/src/crdt_sync/server/mod.rs

@@ -44,13 +44,11 @@ pub async fn crdt_sync_handler(
     // ── Bearer-token check (pre-upgrade) ────────────────────────────
     let require_token = REQUIRE_TOKEN.get().copied().unwrap_or(false);
     match &params.token {
-        Some(t) => {
-            if !validate_join_token(t) {
-                slog!("[crdt-sync] Rejected connection: invalid or expired token");
-                return poem::Response::builder()
-                    .status(StatusCode::UNAUTHORIZED)
-                    .body("invalid or expired token");
-            }
+        Some(t) if !validate_join_token(t) => {
+            slog!("[crdt-sync] Rejected connection: invalid or expired token");
+            return poem::Response::builder()
+                .status(StatusCode::UNAUTHORIZED)
+                .body("invalid or expired token");
         }
         None if require_token => {
             slog!("[crdt-sync] Rejected connection: token required but not provided");
@@ -58,7 +56,7 @@ pub async fn crdt_sync_handler(
                 .status(StatusCode::UNAUTHORIZED)
                 .body("token required");
         }
-        None => {}
+        _ => {}
     }
 
     // ── WebSocket upgrade ────────────────────────────────────────────