feat: enhance desktop computer-use streaming with neko integration

Improve desktop streaming architecture, add inspector dev tooling,
React DesktopViewer updates, and computer-use documentation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/compose.dev.yaml

@@ -0,0 +1,42 @@
+name: sandbox-agent-dev
+
+services:
+  backend:
+    build:
+      context: ..
+      dockerfile: docker/test-agent/Dockerfile
+    image: sandbox-agent-dev
+    command: ["server", "--host", "0.0.0.0", "--port", "3000", "--no-token"]
+    environment:
+      RUST_LOG: "${RUST_LOG:-info}"
+    ports:
+      - "2468:3000"
+      # UDP port range for WebRTC media transport (neko)
+      - "59050-59070:59050-59070/udp"
+
+  frontend:
+    build:
+      context: ..
+      dockerfile: docker/inspector-dev/Dockerfile
+    working_dir: /app
+    depends_on:
+      - backend
+    environment:
+      SANDBOX_AGENT_URL: "http://backend:3000"
+    ports:
+      - "5173:5173"
+    volumes:
+      - "..:/app"
+      # Keep Linux-native node_modules inside the container.
+      - "sa_root_node_modules:/app/node_modules"
+      - "sa_inspector_node_modules:/app/frontend/packages/inspector/node_modules"
+      - "sa_react_node_modules:/app/sdks/react/node_modules"
+      - "sa_typescript_node_modules:/app/sdks/typescript/node_modules"
+      - "sa_pnpm_store:/root/.local/share/pnpm/store"
+
+volumes:
+  sa_root_node_modules: {}
+  sa_inspector_node_modules: {}
+  sa_react_node_modules: {}
+  sa_typescript_node_modules: {}
+  sa_pnpm_store: {}