Refine health checks and add polling animation

app/README.md

@@ -0,0 +1,50 @@
+# 1. Run Applicaiton
+
+1. Removes all cached Python packages stored by pip, removes local Python cache files, clears the cache used by uv, and forcibly clear the cache for Node.js.
+
+    ```bash
+    uv tool install cleanpy
+    pip cache purge && cleanpy . && uv cache clean && npm cache clean --force
+    ```
+
+2. Resolve dependencies from your *pyproject.toml* and upgrade all packages. Synchronize the virtual environment with the dependencies specified in the *uv.lock* including packages needed for development.
+
+    ```bash
+    cd backend
+    uv lock --upgrade
+    uv sync --dev
+    ```
+
+3. Lint and check code for errors, style issues, and potential bugs, and try to fix them. Discover and run tests in *tests/*.
+
+    ```bash
+    uv run ruff check --fix && uv run pytest
+    ```
+
+4. Starts a local development API server, visible at port 8000, and automatically reloads the server as you make code changes.
+
+    ```bash
+    uv run uvicorn src.main:app --reload --port 8000
+    ```
+
+5. Scans dependencies for security vulnerabilities and attempts to automatically fix them by force-updating to the latest secure versions.
+
+    ```bash
+    cd ..
+    cd frontend
+    npm audit fix --force
+    ```
+
+6. Install dependencies from *package.json*, then update those dependencies to the latest allowed versions based on version ranges. Next, check the source code for stylistic and syntax errors according to configured rules. Finally, compile or bundle the application for deployment or production use.
+
+    ```bash
+    cd frontend
+    npm install && npm update && npm run lint && npm run build
+    ```
+
+7. Execute start script in *package.json*, launch your Node.js application in production mode.
+
+    ```bash
+    cd frontend
+    npm run start
+    ```