fix: M1 exclude_paths '/' jamulix, M2 seed-should_crawl filter, M3 alert dedup

- M1: Removed '/' from jamulix.de exclude_paths (blockaded ALL paths via startswith)
- M2: Seed URLs now pass through should_crawl() in crawler.py
- M3: Alert deduplication via last_alert.json (hash of reasons+level+score)
- Added 11 tests for alert deduplication (277 total, all green)

scanner/crawler.py

@@ -112,9 +112,18 @@ class Crawler:
             queue: list[str] = [
                 normalize_url(self.target + p) or (self.target + p)
                 for p in self.include_paths
+                if should_crawl(
+                    normalize_url(self.target + p) or (self.target + p),
+                    self.base_netloc, self.skip_ext,
+                    self.exclude_paths, self.include_paths,
+                )
             ]
         else:
-            queue: list[str] = [normalize_url(self.target + "/") or self.target + "/"]
+            seed = normalize_url(self.target + "/") or self.target + "/"
+            queue: list[str] = [seed] if should_crawl(
+                seed, self.base_netloc, self.skip_ext,
+                self.exclude_paths, self.include_paths,
+            ) else []
         pages: list[dict] = []
         errors: list[dict] = []