Initial GuruConnect implementation - Phase 1 MVP

- Agent: DXGI/GDI screen capture, mouse/keyboard input, WebSocket transport
- Server: Axum relay, session management, REST API
- Dashboard: React viewer components with TypeScript
- Protocol: Protobuf definitions for all message types

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server/src/api/mod.rs

@@ -0,0 +1,54 @@
+//! REST API endpoints
+
+use axum::{
+    extract::{Path, State},
+    Json,
+};
+use serde::Serialize;
+use uuid::Uuid;
+
+use crate::session::SessionManager;
+
+/// Session info returned by API
+#[derive(Debug, Serialize)]
+pub struct SessionInfo {
+    pub id: String,
+    pub agent_id: String,
+    pub agent_name: String,
+    pub started_at: String,
+    pub viewer_count: usize,
+}
+
+impl From<crate::session::Session> for SessionInfo {
+    fn from(s: crate::session::Session) -> Self {
+        Self {
+            id: s.id.to_string(),
+            agent_id: s.agent_id,
+            agent_name: s.agent_name,
+            started_at: s.started_at.to_rfc3339(),
+            viewer_count: s.viewer_count,
+        }
+    }
+}
+
+/// List all active sessions
+pub async fn list_sessions(
+    State(sessions): State<SessionManager>,
+) -> Json<Vec<SessionInfo>> {
+    let sessions = sessions.list_sessions().await;
+    Json(sessions.into_iter().map(SessionInfo::from).collect())
+}
+
+/// Get a specific session by ID
+pub async fn get_session(
+    State(sessions): State<SessionManager>,
+    Path(id): Path<String>,
+) -> Result<Json<SessionInfo>, (axum::http::StatusCode, &'static str)> {
+    let session_id = Uuid::parse_str(&id)
+        .map_err(|_| (axum::http::StatusCode::BAD_REQUEST, "Invalid session ID"))?;
+
+    let session = sessions.get_session(session_id).await
+        .ok_or((axum::http::StatusCode::NOT_FOUND, "Session not found"))?;
+
+    Ok(Json(SessionInfo::from(session)))
+}