secrets tab, drop commute filter, favicon, robust error reports

1. Admin → Geheimnisse sub-tab lets you edit ANTHROPIC_API_KEY +
   BERLIN_WOHNEN_USERNAME/PASSWORD at runtime. Migration v7 adds a
   secrets(key,value,updated_at) table; startup seeds missing keys from
   env (idempotent). web reads secrets DB-first (env fallback) via
   llm._api_key(); alert fetches them from web /internal/secrets on each
   scan, passes them into Scraper(). Rotating creds no longer needs a
   redeploy.
   Masked display: 6 leading + 4 trailing chars, "…" in the middle.
   Blank form fields leave the stored value untouched.

2. Drop the max_morning_commute filter from UI + server + FILTER_KEYS +
   filter summary (the underlying Maps.calculate_score code stays for
   potential future re-enable).

3. /static/didi.webp wired as favicon via <link rel="icon"> in base.html.

4. apply.open_page wraps page.goto in try/except so a failed load still
   produces a "goto.failed" step + screenshot instead of returning an
   empty forensics blob. networkidle + post-submission sleep are also
   made best-effort. The error ZIP export already writes screenshot+HTML
   per step and final_html — with this change every apply run leaves a
   reconstructable trail even when the listing is already offline.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

alert/scraper.py

@@ -2,7 +2,7 @@ import requests
 import re
 import logging
 from bs4 import BeautifulSoup
-from settings import BERLIN_WOHNEN_USERNAME, BERLIN_WOHNEN_PASSWORD
+from settings import BERLIN_WOHNEN_USERNAME, BERLIN_WOHNEN_PASSWORD  # env fallback
 
 logger = logging.getLogger("flat-alert")
 
@@ -19,11 +19,16 @@ class Scraper:
         'Upgrade-Insecure-Requests': '1',
     }
 
-    def __init__(self):
+    def __init__(self, username: str = "", password: str = ""):
+        self.username = username or BERLIN_WOHNEN_USERNAME
+        self.password = password or BERLIN_WOHNEN_PASSWORD
         self.session = requests.Session()
         self.session.headers.update(self.HEADERS)
 
     def login(self):
+        if not self.username or not self.password:
+            logger.critical("BERLIN_WOHNEN credentials missing — nothing to log in with")
+            return False
         logger.info("fetching inberlinwohnen.de login page")
         resp_login_page = self.session.get(self.URL_LOGIN, timeout=30)
         token_search = re.search(r'name="csrf-token" content="([^"]+)"', resp_login_page.text)
@@ -34,8 +39,8 @@ class Scraper:
 
         payload_login = {
             '_token': csrf_token,
-            'email': BERLIN_WOHNEN_USERNAME,
-            'password': BERLIN_WOHNEN_PASSWORD,
+            'email': self.username,
+            'password': self.password,
             'remember': 'on'
         }
         headers_login = self.HEADERS.copy()