Sync upstream features; preserve fork KV scanner, parsers, verifier

Brought in 35 upstream commits (MITRE heatmap, health score, dependency map,
PowerQuery playground, onboarding tracker, product grouping, modern UI redesign).

Preserved fork additions:
  backend/routers/quality.py  KV scanner, pattern refs, JS keys, JSON mode,
                              /parsers + /sync-from-sdl endpoints
  parsers/                    96 OCSF + tenant parsers
  tools/stormshield-verify/   end-to-end ingest regression test
  .gitignore                  un-ignored parsers/*
  CHANGES.md, PATCHES.md

parsers/ueba_test_same_feat_replace

@@ -0,0 +1,13 @@
+{
+  "columnNames": ["entity_id", "feature_name", "value"],
+  "rows": [
+    [".anna.schmidt", "featG_same", 16],
+    [".lisa.bauer", "featG_same", 9],
+    [".thomas.weber", "featG_same", 18],
+    ["admin.klaus.fischer", "featG_same", 17],
+    ["billing.clerk.peter.wolf", "featG_same", 19],
+    ["lab.tech.sarah.koch", "featG_same", 9],
+    ["nurse.maria.m\\u00fcller", "featG_same", 16],
+    ["pharmacist.hans.meyer", "featG_same", 17]
+  ]
+}