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

cli/Cargo.toml

@@ -1,18 +1,18 @@
-[package]
-name = "silentdragonxlite-cli"
-version = "1.0.0"
-edition = "2018"
-
-[dependencies]
-rustyline = "5.0.2"
-clap = "2.33"
-log = "0.4"
-log4rs = "0.8.3"
-shellwords = "1.0.0"
-json = "0.12.0"
-http = "0.2"
-byteorder = "1"
-tiny-bip39 = "0.6.2"
-
-silentdragonxlitelib = { path = "../lib/" }
-
+[package]
+name = "silentdragonxlite-cli"
+version = "1.0.0"
+edition = "2018"
+
+[dependencies]
+rustyline = "5.0.2"
+clap = "2.33"
+log = "0.4"
+log4rs = "0.8.3"
+shellwords = "1.0.0"
+json = "0.12.0"
+http = "0.2"
+byteorder = "1"
+tiny-bip39 = "0.6.2"
+
+silentdragonxlitelib = { path = "../lib/" }
+