feat(mcp): add LLM server crate and remote client integration

- Introduce `owlen-mcp-llm-server` crate with RPC handling, `generate_text` tool, model listing, and streaming notifications.
- Add `RpcNotification` struct and `MODELS_LIST` method to the MCP protocol.
- Update `owlen-core` to depend on `tokio-stream`.
- Adjust Ollama provider to omit empty `tools` field for compatibility.
- Enhance `RemoteMcpClient` to locate the renamed server binary, handle resource tools locally, and implement the `Provider` trait (model listing, chat, streaming, health check).
- Add new crate to workspace `Cargo.toml`.

crates/owlen-core/src/mcp/protocol.rs

@@ -161,6 +161,25 @@ impl RpcErrorResponse {
     }
 }
 
+/// JSON‑RPC notification (no id). Used for streaming partial results.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct RpcNotification {
+    pub jsonrpc: String,
+    pub method: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub params: Option<Value>,
+}
+
+impl RpcNotification {
+    pub fn new(method: impl Into<String>, params: Option<Value>) -> Self {
+        Self {
+            jsonrpc: JSONRPC_VERSION.to_string(),
+            method: method.into(),
+            params,
+        }
+    }
+}
+
 /// Request ID can be string, number, or null
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
 #[serde(untagged)]
@@ -194,6 +213,7 @@ pub mod methods {
     pub const RESOURCES_GET: &str = "resources/get";
     pub const RESOURCES_WRITE: &str = "resources/write";
     pub const RESOURCES_DELETE: &str = "resources/delete";
+    pub const MODELS_LIST: &str = "models/list";
 }
 
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