fix(intel-scan): remove duplicate _entry_matches + replace dead NVD feed

1. Duplicate function definition: the old 2-param _entry_matches shadowed
   the new 3-param version — Python uses the last definition, so the call
   with 3 args threw TypeError. Removed the stale old definition.

2. NIST NVD deprecated their XML RSS feeds in 2023 — URL returns 404.
   Replaced with SecurityWeek RSS which is active and covers CVEs/threats.

backend/app/services/intel_service.py

@@ -33,8 +33,8 @@ RSS_FEEDS: list[dict[str, str]] = [
         "url": "https://www.cisa.gov/cybersecurity-advisories/all.xml",
     },
     {
-        "name": "NIST NVD CVE",
+        "name": "SecurityWeek",
-        "url": "https://nvd.nist.gov/feeds/xml/cve/misc/nvd-rss.xml",
+        "url": "https://feeds.feedburner.com/Securityweek",
     },
     {
         "name": "SANS ISC",
@@ -151,12 +151,6 @@ def _entry_matches(
     return any(p.search(text) for p in id_patterns + name_patterns)
 
 
-def _entry_matches(entry: dict[str, str], patterns: list[re.Pattern]) -> bool:
-    """Return True if any pattern matches the entry's title or description."""
-    text = f"{entry.get('title', '')} {entry.get('description', '')}"
-    return any(p.search(text) for p in patterns)
-
-
 # ---------------------------------------------------------------------------
 # Public API
 # ---------------------------------------------------------------------------