test(e2e): add venv + playwright deps and robust Matomo API auth flow

- Add optional dependency group "e2e" with Playwright in pyproject.toml
- Teach Makefile to create/use local .venv, install e2e deps, and fetch Chromium
- Wait for Matomo HTTP response (any status) before running bootstrap
- Switch API calls to /index.php and add HttpClient.get()
- Use UsersManager.getTokenAuth (md5Password) to obtain token_auth for privileged calls
- Make web installer more resilient to HTTPError/500 and locale/button variations
- Update E2E test to pass admin email and call API via /index.php

https://chatgpt.com/share/694a70b0-e520-800f-a3e4-eaf5e96530bd

src/matomo_bootstrap/bootstrap.py

@@ -1,15 +1,13 @@
 from argparse import Namespace
+
+from .api_tokens import create_app_token, get_token_auth
 from .health import assert_matomo_ready
 from .http import HttpClient
-from .api_tokens import create_app_token
 from .install.web_installer import ensure_installed
 
 
 def run_bootstrap(args: Namespace) -> str:
-    # 1. Matomo erreichbar?
-    assert_matomo_ready(args.base_url, timeout=args.timeout)
-
-    # 2. Installation sicherstellen (NO-OP wenn bereits installiert)
+    # 1) Ensure Matomo is installed (NO-OP if already installed)
     ensure_installed(
         base_url=args.base_url,
         admin_user=args.admin_user,
@@ -18,15 +16,25 @@ def run_bootstrap(args: Namespace) -> str:
         debug=args.debug,
     )
 
-    # 3. API-Token erzeugen
+    # 2) Now the UI/API should be reachable and "installed"
+    assert_matomo_ready(args.base_url, timeout=args.timeout)
+
+    # 3) Create authenticated API token flow (no UI session needed)
     client = HttpClient(
         base_url=args.base_url,
         timeout=args.timeout,
         debug=args.debug,
     )
 
+    admin_token_auth = get_token_auth(
+        client=client,
+        admin_user=args.admin_user,
+        admin_password=args.admin_password,
+    )
+
     token = create_app_token(
         client=client,
+        admin_token_auth=admin_token_auth,
         admin_user=args.admin_user,
         admin_password=args.admin_password,
         description=args.token_description,