feat: add is_disney column for reliable Disney/Non-Disney filtering

- Added is_disney INTEGER DEFAULT 0 column to assets table
- Backfilled 996 Disney assets based on D- customer prefix
- Server: is_disney in AssetCreate/AssetUpdate models, INSERT/UPDATE
- Server: disney_filter query param now uses is_disney column (no JOIN needed)
- import_cantaloupe.py: sets is_disney=1 when customer starts with D-
- import_machines.py: sets is_disney=1 when customer starts with D-
- disney_classify.py: sets is_disney=1 when classifying
- Frontend: new Location Type dropdown with Disney/Non-Disney toggle
  (replaces the __disney__/__non_disney__ park dropdown pseudo-options)

import_machines.py

@@ -63,6 +63,7 @@ def main(xlsx_path):
             machine_id = _sanitize_machine_id(str(int(row[2])))
             location_str = str(row[1]) if row[1] else ''   # "Company - Address"
             customer_name = str(row[21]) if row[21] else '' # Customer
+            is_disney = 1 if customer_name.strip().startswith('D-') else 0
             address = str(row[6]) if row[6] else ''
             city = str(row[5]) if row[5] else ''
             state = str(row[33]) if row[33] else ''
@@ -136,10 +137,10 @@ def main(xlsx_path):
                 cursor = conn.execute("""
                     INSERT INTO assets
                         (machine_id, name, serial_number, make, model, category,
-                         status, address, customer_id, created_at, updated_at, description)
-                    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, datetime('now'), datetime('now'), ?)
+                         status, address, customer_id, is_disney, created_at, updated_at, description)
+                    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, datetime('now'), datetime('now'), ?)
                 """, (machine_id, name, serial, make, model, cat,
-                      status, full_address, customer_id,
+                      status, full_address, customer_id, is_disney,
                       device + ' | Branch: ' + branch if branch else device))
                 aid = cursor.lastrowid
                 existing_assets[machine_id] = aid