feat(workspace): initialize Rust workspace structure for v2

Set up Cargo workspace with initial crates:
- cli: main application entry point with chat streaming tests
- config: configuration management
- llm/ollama: Ollama client integration with NDJSON support

Includes .gitignore for Rust and JetBrains IDEs.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

crates/cli/tests/chat_stream.rs

@@ -0,0 +1,39 @@
+use assert_cmd::Command;
+use httpmock::prelude::*;
+use predicates::prelude::PredicateBooleanExt;
+
+#[tokio::test]
+async fn headless_streams_ndjson() {
+    let server = MockServer::start_async().await;
+    // Mock /api/chat with NDJSON lines
+    let body = serde_json::json!({
+        "model": "qwen2.5",
+        "messages": [{"role": "user", "content": "hello"}],
+        "stream": true
+    });
+
+    let response = concat!(
+        r#"{"message":{"role":"assistant","content":"Hel"}}"#,"\n",
+        r#"{"message":{"role":"assistant","content":"lo"}}"#,"\n",
+        r#"{"done":true}"#,"\n",
+    );
+
+    let _m = server.mock(|when, then| {
+        when.method(POST)
+            .path("/api/chat")
+            .json_body(body.clone());
+        then.status(200)
+            .header("content-type", "application/x-ndjson")
+            .body(response);
+    });
+
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("code"));
+    cmd.arg("--ollama-url").arg(server.base_url())
+        .arg("--model").arg("qwen2.5")
+        .arg("--print")
+        .arg("hello");
+
+    cmd.assert()
+        .success()
+        .stdout(predicates::str::contains("Hello").count(1).or(predicates::str::contains("Hel").and(predicates::str::contains("lo"))));
+}