Python: feat: Add ChatKit integration with a sample application (#1273)

* feat: Add ChatKit integration with a new frontend application

- Created a new frontend application using React and Vite for the ChatKit integration.
- Added essential files including package.json, vite.config.ts, and Tailwind CSS configuration.
- Implemented core components: App, Home, ChatKitPanel, ThemeToggle, and hooks for color scheme management.
- Established SQLite-based store implementation for ChatKit data persistence in store.py.
- Integrated theme toggling functionality for light and dark modes.
- Set up ESLint and TypeScript configurations for better development experience.

* git ignore

* fix mypy

* add mising file

* minimal frontend for chatkit sample

* update ignore files

* version

* set python version lowerbound on chatkit

* update project settings for chatkit

* update setup

* update setup

* update setup

* update setup

* weather widget

* add select city widget sample

* remove widget helper

* update chatkit to include file attachments and cover more thread item types

* update readme with mermaid diagram

* update diagram

* update instructions

* update chatkit dependency

* fix converter imports

* move to demos/

* move to demos/ -- rename references

* support multiple session instead of using global variable in sample

* support chunk streaming

* fix tests

* Update python/samples/demos/chatkit-integration/store.py

Co-authored-by: Evan Mattson <35585003+moonbox3@users.noreply.github.com>

* use local host

---------

Co-authored-by: Evan Mattson <35585003+moonbox3@users.noreply.github.com>

python/samples/demos/chatkit-integration/frontend/package.json

@@ -0,0 +1,27 @@
+{
+    "name": "chatkit-agent-framework-demo",
+    "version": "0.1.0",
+    "private": true,
+    "type": "module",
+    "scripts": {
+        "dev": "vite",
+        "build": "vite build",
+        "preview": "vite preview"
+    },
+    "engines": {
+        "node": ">=18.18",
+        "npm": ">=9"
+    },
+    "dependencies": {
+        "@openai/chatkit-react": "^0",
+        "react": "^19.2.0",
+        "react-dom": "^19.2.0"
+    },
+    "devDependencies": {
+        "@types/react": "^19.2.0",
+        "@types/react-dom": "^19.2.0",
+        "@vitejs/plugin-react-swc": "^3.5.0",
+        "typescript": "^5.4.0",
+        "vite": "^7.1.9"
+    }
+}