Add UI to view and run scenes and show analysis in UI itself

.gitignore

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 venv/
+*/node_modules/

transaction-analyzer-server/README.md

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+# Transaction Analyzer Server
+
+A Node.js backend server that provides APIs for the Transaction Success Rate Analyzer web application. This server automatically scans for test case CSV files in the decision-engine-testing project and serves them through a REST API.
+
+## Features
+
+- **Automatic Test Case Discovery**: Scans all scene directories for `transactions.csv` files
+- **REST API**: Provides endpoints to list test cases and retrieve CSV data
+- **Schema Integration**: Reads `schema.yaml` files for test case descriptions
+- **Web Interface**: Serves an enhanced HTML interface with test case selection
+- **CORS Support**: Enables cross-origin requests for development
+
+## API Endpoints
+
+### GET /api/testcases
+Returns a list of all available test cases with metadata.
+
+**Response:**
+```json
+{
+  "testcases": [
+    {
+      "scene_name": "scene-1",
+      "file_path": "scene-1/transactions.csv",
+      "description": "Test case description from schema.yaml"
+    }
+  ],
+  "total_count": 20
+}
+```
+
+### GET /api/testcases/:sceneName/csv
+Returns the CSV content for a specific test case.
+
+**Parameters:**
+- `sceneName`: The name of the scene (e.g., "scene-1")
+
+**Response:** Raw CSV content with appropriate headers
+
+### GET /
+Serves the main web interface for analyzing transaction data.
+
+## Installation
+
+1. Navigate to the server directory:
+```bash
+cd transaction-analyzer-server
+```
+
+2. Install dependencies:
+```bash
+npm install
+```
+
+3. Start the server:
+```bash
+npm start
+```
+
+Or for development with auto-reload:
+```bash
+npm run dev
+```
+
+## Usage
+
+1. Start the server (it will run on http://localhost:3001 by default)
+2. Open your browser and navigate to http://localhost:3001
+3. Select a test case from the grid or upload your own CSV files
+4. Analyze transaction success rates with interactive charts
+
+## Project Structure
+
+```
+transaction-analyzer-server/
+├── package.json          # Node.js dependencies and scripts
+├── server.js             # Main server application
+├── public/
+│   └── index.html        # Web interface
+└── README.md            # This file
+```
+
+## Dependencies
+
+- **express**: Web framework for Node.js
+- **cors**: Enable CORS for cross-origin requests
+- **yaml**: Parse YAML schema files
+- **nodemon**: Development dependency for auto-reload
+
+## Environment Variables
+
+- `PORT`: Server port (default: 3001)
+
+## Test Case Structure
+
+The server expects test cases to be organized as follows:
+
+```
+../scene-X/
+├── transactions.csv      # Required: Transaction data
+└── schema.yaml          # Optional: Test case metadata
+```
+
+The `schema.yaml` file should contain a `description` field for test case documentation.