Add Windows startup config and Jellyfin API test script

Added startup.json with Windows-specific default paths and documentation for Jellyfin configuration. Introduced test_api.py, a Python script to authenticate with Jellyfin, create a backup, and list backups using the REST API.

Jellyfin.Server/startup.json

@@ -0,0 +1,14 @@
+{
+  "_comment": "Jellyfin Startup Configuration - Windows defaults - using C:/ProgramData/jellyfin",
+  "_note": "These paths will be used unless overridden by environment variables or command-line arguments",
+  "_priority": "Command-line args \u003E Environment variables \u003E This file \u003E Built-in defaults",
+  "_examples": "See startup.linux.json or startup.windows.json in Resources/Configuration for other OS examples",
+  "Paths": {
+    "DataDir": "C:/ProgramData/jellyfin",
+    "ConfigDir": "C:/ProgramData/jellyfin",
+    "CacheDir": "C:/ProgramData/jellyfin/cache",
+    "LogDir": "C:/ProgramData/jellyfin/log",
+    "TempDir": "C:\\Users\\wjones\\AppData\\Local\\Temp\\jellyfin",
+    "WebDir": "C:/ProgramData/jellyfin/wwwroot"
+  }
+}

test_api.py

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+import requests
+
+# Define connection details
+server_url = 'http://localhost:8096'
+username = 'admin'
+password = 'Optimus0329'
+
+backup_options = {
+    "Database": True,      # Include database
+    "Config": True,        # Include config files
+    "Data": True,          # Include data files
+    "Root": True,          # Include root folder
+    "MediaFiles": False    # Exclude media files
+}
+
+# Build json payload with auth data
+auth_data = {
+    'username': username,
+    'Pw': password
+}
+
+headers = {}
+
+# Build required connection headers
+authorization = 'MediaBrowser Client="other", Device="my-script", DeviceId="some-unique-id", Version="0.0.0"'
+
+headers['Authorization'] = authorization
+
+# Authenticate to server
+r = requests.post(server_url + '/Users/AuthenticateByName', headers=headers, json=auth_data)
+
+# Retrieve auth token and user id from returned data
+token = r.json().get('AccessToken')
+user_id = r.json().get('User').get('Id')
+
+# Update the headers to include the auth token
+headers['Authorization'] = f'{authorization}, Token="{token}"'
+headers['Content-Type'] = 'application/json'
+
+# Requests can be made with
+#requests.get(f'{server_url}/api/endpoint', headers=headers)
+
+# Create a backup (empty body is OK, will use default options)
+print("Creating backup...")
+response = requests.post(f'{server_url}/Backup/Create', headers=headers, json={})
+print(f"Status: {response.status_code}")
+print(response.text)
+
+# List all backups
+print("\nListing backups...")
+response = requests.get(f'{server_url}/Backup', headers=headers)
+print(f"Status: {response.status_code}")
+print(response.text)