feat: initial xserial-core with transport, protocol, frame, and pipeline layers

- transport: async Serial/TCP/UDP via Connection enum + Transport trait
- protocol: TextDecoder (UTF-8/Latin-1/ASCII), HexDecoder, PlotDecoder (binary samples)
- frame: LineFramer, FixedLengthFramer, LengthPrefixedFramer, CobsFramer
- pipeline: MultiPipeline for parallel multi-protocol parsing
- 212 tests (182 unit + 18 integration + 1 doctest), clippy clean

crates/xserial-tui/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "xserial-tui"
+version = "0.1.0"
+edition = "2024"
+
+[[bin]]
+name = "xserial-tui"
+path = "src/main.rs"
+
+[dependencies]
+xserial-core = { path = "../xserial-core" }
+xserial-client = { path = "../xserial-client" }
+tokio = { workspace = true }
+ratatui = { workspace = true }
+crossterm = { workspace = true }
+tracing = { workspace = true }
+tracing-subscriber = { workspace = true }
+tracing-appender = { workspace = true }
+clap = { workspace = true }
+hex = { workspace = true }
+image = { workspace = true }

crates/xserial-tui/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    
+}