Integrate OpenRouter for AI-powered code review

Add openrouter-rs dependency, review prompt, and markdown formatting.
Update comment API to accept dynamic body. Adjust devcontainer for
podman compatibility.

src/open_router.rs

@@ -0,0 +1,34 @@
+use openrouter_rs::{Message, api::chat::ChatCompletionRequest};
+
+pub struct OpenRouterClient {
+    client: openrouter_rs::OpenRouterClient,
+    model: String,
+}
+
+impl OpenRouterClient {
+    pub fn new(token: &str, model: &str) -> anyhow::Result<Self> {
+        Ok(Self {
+            client: openrouter_rs::OpenRouterClient::builder()
+                .api_key(token)
+                .build()?,
+            model: String::from(model),
+        })
+    }
+
+    pub async fn chat(&self, msg: &str) -> anyhow::Result<String> {
+        let request = ChatCompletionRequest::builder()
+            .model(&self.model)
+            .messages(vec![Message::new(
+                openrouter_rs::types::Role::Developer,
+                msg,
+            )])
+            .build()?;
+
+        let response = self.client.chat().create(&request).await?;
+
+        response.choices[0]
+            .content()
+            .map(|msg| String::from(msg))
+            .ok_or(anyhow::anyhow!("No content"))
+    }
+}