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/llm/ollama/tests/ndjson.rs

@@ -0,0 +1,12 @@
+use llm_ollama::{OllamaClient, OllamaOptions};
+
+// This test stubs NDJSON by spinning a tiny local server is overkill for M0.
+// Instead, test the line parser indirectly by mocking reqwest is complex.
+// We'll smoke-test the client type compiles and leave end-to-end to cli tests.
+
+#[tokio::test]
+async fn client_compiles_smoke() {
+    let _ = OllamaClient::new("http://localhost:11434");
+    let _ = OllamaClient::with_cloud();
+    let _ = OllamaOptions { model: "qwen2.5".into(), stream: true };
+}