feat(ctrader-openapi): scaffold crate with config and error types

New workspace crate for cTrader Open API client (Protobuf over TCP+TLS).
Adds CTraderConfig (environment, credentials, timeouts), CTraderError
enum covering all failure modes, and lib.rs module structure.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Cargo.lock

@@ -2759,6 +2759,26 @@ dependencies = [
  "cipher",
 ]
 
+[[package]]
+name = "ctrader-openapi"
+version = "1.0.0"
+dependencies = [
+ "bytes",
+ "chrono",
+ "native-tls",
+ "prost 0.14.1",
+ "prost-build",
+ "reqwest 0.12.23",
+ "serde",
+ "serde_json",
+ "thiserror 1.0.69",
+ "tokio",
+ "tokio-native-tls",
+ "tokio-util",
+ "tracing",
+ "uuid",
+]
+
 [[package]]
 name = "cudarc"
 version = "0.17.3"
@@ -6314,6 +6334,15 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d05e27ee213611ffe7d6348b942e8f942b37114c00cc03cec254295a4a17852e"
 
+[[package]]
+name = "openssl-src"
+version = "300.5.3+3.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc6bad8cd0233b63971e232cc9c5e83039375b8586d2312f31fda85db8f888c2"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "openssl-sys"
 version = "0.9.109"
@@ -6322,6 +6351,7 @@ checksum = "90096e2e47630d78b7d1c20952dc621f957103f8bc2c8359ec81290d75238571"
 dependencies = [
  "cc",
  "libc",
+ "openssl-src",
  "pkg-config",
  "vcpkg",
 ]