Crash fixes, reorg handling, and sync performance improvements

- Fix FFI panics with catch_unwind and safe CString construction
- Handle poisoned mutex/RwLock after prior panics instead of crashing
- Fix empty block list panics in clear_blocks and invalidate_block
- Reuse Tokio runtime across block fetch batches to reduce overhead
- Add fetch_blocks_with_runtime for caller-managed runtime lifecycle
- Update branding, dependencies, and checkpoints for DragonX

Cargo.toml

@@ -1,8 +1,8 @@
-[workspace]
-members = [
-    "lib",
-    "cli",
-]
-
-[profile.release]
+[workspace]
+members = [
+    "lib",
+    "cli",
+]
+
+[profile.release]
 debug = false