Add endpoint tests and consolidate test directory

- Add HTTP endpoint tests to mimic browser interactions
- Move old test files from test/ to tests/ directory
- Add comprehensive endpoint tests for tabs, profiles, presets, patterns
- Add README documenting test structure and how to run tests

tests/README.md

@@ -0,0 +1,79 @@
+# Tests
+
+This directory contains tests for the LED Controller project.
+
+## Directory Structure
+
+- `test_endpoints.py` - HTTP endpoint tests that mimic web browser requests (runs against 192.168.4.1)
+- `test_ws.py` - WebSocket tests
+- `test_p2p.py` - ESP-NOW P2P tests
+- `models/` - Model unit tests
+- `web.py` - Local development web server
+
+## Running Tests
+
+### Browser Tests (Real Browser Automation)
+
+Tests the web interface in an actual browser using Selenium:
+
+```bash
+python tests/test_browser.py
+```
+
+These tests:
+- Open a real Chrome browser
+- Navigate to the device at 192.168.4.1
+- Interact with UI elements (buttons, forms, modals)
+- Test complete user workflows
+- Verify visual elements and interactions
+
+**Requirements:**
+```bash
+pip install selenium
+# Also need ChromeDriver installed and in PATH
+# Download from: https://chromedriver.chromium.org/
+```
+
+### Endpoint Tests (Browser-like HTTP)
+
+Tests HTTP endpoints by making requests to the device at 192.168.4.1:
+
+```bash
+python tests/test_endpoints.py
+```
+
+These tests:
+- Mimic web browser requests with proper headers
+- Handle cookies for session management
+- Test all CRUD operations (GET, POST, PUT, DELETE)
+- Verify responses and status codes
+
+**Requirements:**
+```bash
+pip install requests
+```
+
+### WebSocket Tests
+
+```bash
+python tests/test_ws.py
+```
+
+**Requirements:**
+```bash
+pip install websockets
+```
+
+### Model Tests
+
+```bash
+python tests/models/run_all.py
+```
+
+### Local Development Server
+
+Run the local development server (port 5000):
+
+```bash
+python tests/web.py
+```