Add per-domain global-search toggles

Lets an admin choose which content types appear in global search results,
independent of whether the owning plugin is enabled (the existing
_require_enabled gating was all-or-nothing per plugin).

- settings.py: SEARCH_DOMAINS const (9 result types: application, knowledgebase,
  employee, equipment, computer, printer, network_device, notification, subnet)
  + seed keys search_<type>_enabled (boolean, default true) in
  build_default_settings (covers API seed + CLI).
- search.py: global_search loads disabled types in one query (category 'search')
  and filters the deduped results by type before counts/truncation. Missing key
  = enabled.
- SystemSettings.vue: "Global Search" section, one toggle per domain (mirrors the
  identifier pattern; create-on-404 fallback so an un-reseeded deploy still works).
- Tests: domain included by default, disabled domain excluded, seed creates the
  9 keys.

166 tests pass, naming green, build green. Verified live: toggling
search_knowledgebase_enabled off drops knowledgebase from search counts and back
on restores it. Dev DB seeded (9 keys).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

shopdb/core/api/search.py

@@ -11,7 +11,7 @@ from sqlalchemy.orm import joinedload
 
 from shopdb.extensions import db
 from shopdb.core.models import (
-    Application,
+    Application, Setting,
     Asset, AssetType, Communication, Vendor, Model
 )
 from shopdb.utils.responses import success_response
@@ -718,6 +718,16 @@ def global_search():
             seen_ids[key] = True
             unique_results.append(r)
 
+    # Drop result types disabled in Settings > Search (search_<type>_enabled).
+    # Missing key = enabled. One query, default-on.
+    disabled_types = {
+        s.key[len('search_'):-len('_enabled')]
+        for s in Setting.query.filter_by(category='search').all()
+        if s.get_typed_value() is False
+    }
+    if disabled_types:
+        unique_results = [r for r in unique_results if r['type'] not in disabled_types]
+
     # Compute type counts before truncation
     type_counts = {}
     for r in unique_results: