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/cli.py

@@ -1,4 +1,5 @@
 import argparse
+import os
 
 
 def parse_args() -> argparse.Namespace:
@@ -6,12 +7,46 @@ def parse_args() -> argparse.Namespace:
         description="Headless bootstrap tool for Matomo (installation + API token provisioning)"
     )
 
-    p.add_argument("--base-url", required=True, help="Matomo base URL")
-    p.add_argument("--admin-user", required=True)
-    p.add_argument("--admin-password", required=True)
-    p.add_argument("--admin-email", required=True)
-    p.add_argument("--token-description", default="matomo-bootstrap")
-    p.add_argument("--timeout", type=int, default=20)
+    p.add_argument(
+        "--base-url",
+        default=os.environ.get("MATOMO_URL"),
+        help="Matomo base URL (or MATOMO_URL env)",
+    )
+    p.add_argument(
+        "--admin-user",
+        default=os.environ.get("MATOMO_ADMIN_USER"),
+        help="Admin login (or MATOMO_ADMIN_USER env)",
+    )
+    p.add_argument(
+        "--admin-password",
+        default=os.environ.get("MATOMO_ADMIN_PASSWORD"),
+        help="Admin password (or MATOMO_ADMIN_PASSWORD env)",
+    )
+    p.add_argument(
+        "--admin-email",
+        default=os.environ.get("MATOMO_ADMIN_EMAIL"),
+        help="Admin email (or MATOMO_ADMIN_EMAIL env)",
+    )
+    p.add_argument(
+        "--token-description",
+        default=os.environ.get("MATOMO_TOKEN_DESCRIPTION", "matomo-bootstrap"),
+    )
+    p.add_argument("--timeout", type=int, default=int(os.environ.get("MATOMO_TIMEOUT", "20")))
     p.add_argument("--debug", action="store_true")
 
-    return p.parse_args()
+    args = p.parse_args()
+
+    missing = []
+    if not args.base_url:
+        missing.append("--base-url (or MATOMO_URL)")
+    if not args.admin_user:
+        missing.append("--admin-user (or MATOMO_ADMIN_USER)")
+    if not args.admin_password:
+        missing.append("--admin-password (or MATOMO_ADMIN_PASSWORD)")
+    if not args.admin_email:
+        missing.append("--admin-email (or MATOMO_ADMIN_EMAIL)")
+
+    if missing:
+        p.error("missing required values: " + ", ".join(missing))
+
+    return args