harden CSV import reconciliation and preserve saved model selections

Default fuzzy reconcile threshold to 0 and refuse merges when digit runs differ so numbered labels like Bay 311 never bind to Bay 310. Keep edit forms from clearing saved model fields when category filtering hides untyped rows. Includes in-progress computers policy and endpoints command feature work.

plugins/computers/policyflag.py

@@ -0,0 +1,19 @@
+"""Single source of truth for the Configuration/Business Policy feature gate.
+
+Kept in its own module (not on the plugin class) so the CRUD routes, the panel
+surface, and the endpoints enforcement path can all consult the same switch
+without importing ComputersPlugin. The flag is the computers_configpolicies_enabled
+Setting row seeded by the plugin's get_settings_defaults; while it is off, every
+policy code path no-ops, which is the exit gate for rolling the feature back.
+"""
+
+
+def policy_flag_enabled():
+    """True when computers_configpolicies_enabled is set truthy."""
+    from shopdb.api import Setting
+
+    setting = Setting.query.filter_by(
+        key='computers_configpolicies_enabled').first()
+    if not setting:
+        return False
+    return (setting.value or '').strip().lower() in ('true', '1', 'yes')