Add screenshot demo for multimodal LLM analytics testing

Makefile

@@ -1,4 +1,4 @@
-.PHONY: run-python run-node run-python-debug run-node-debug run-trace-generator run-trace-generator-debug python-install python-install-reset python-install-local test-python-weather ingest-trace
+.PHONY: run-python run-node run-python-debug run-node-debug run-trace-generator run-trace-generator-debug run-screenshot-demo run-screenshot-demo-debug python-install python-install-reset python-install-local test-python-weather ingest-trace
 
 run-python:
 	@cd python && ./run.sh
@@ -18,6 +18,12 @@ run-trace-generator:
 run-trace-generator-debug:
 	@cd python/trace-generator && DEBUG=1 ./run.sh
 
+run-screenshot-demo:
+	@cd python/screenshot-demo && ./run.sh
+
+run-screenshot-demo-debug:
+	@cd python/screenshot-demo && DEBUG=1 ./run.sh
+
 ## Install Python deps only (don’t run app). Respects POSTHOG_PYTHON_PATH or POSTHOG_PYTHON_VERSION
 python-install:
 	@cd python && INSTALL_ONLY=1 ./run.sh

python/screenshot-demo/run.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+# Run the Screenshot Demo
+
+# Get the directory where this script is located
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PYTHON_DIR="$(dirname "$SCRIPT_DIR")"
+
+# Check for DEBUG environment variable
+if [ -z "$DEBUG" ]; then
+    # Load from .env file if not set
+    if [ -f "$PYTHON_DIR/../.env" ]; then
+        export $(grep -E '^DEBUG=' "$PYTHON_DIR/../.env" | xargs)
+    fi
+fi
+
+# Check if virtual environment exists
+if [ ! -d "$PYTHON_DIR/venv" ]; then
+    echo "Virtual environment not found. Please run the main Python app first:"
+    echo "  cd $PYTHON_DIR && ./run.sh"
+    exit 1
+fi
+
+# Activate virtual environment
+source "$PYTHON_DIR/venv/bin/activate"
+
+# Run the screenshot demo
+cd "$SCRIPT_DIR"
+python screenshot_demo.py "$@"