Migrate frontend to plugin-based asset architecture

- Add equipmentApi and computersApi to replace legacy machinesApi
- Add controller vendor/model fields to Equipment model and forms
- Fix map marker navigation to use plugin-specific IDs (equipmentid,
  computerid, printerid, networkdeviceid) instead of assetid
- Fix search to use unified Asset table with correct plugin IDs
- Remove legacy printer search that used non-existent field names
- Enable optional JWT auth for detail endpoints (public read access)
- Clean up USB plugin models (remove unused checkout model)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/usb/plugin.py

@@ -10,7 +10,7 @@ from flask import Flask, Blueprint
 from shopdb.plugins.base import BasePlugin, PluginMeta
 from shopdb.extensions import db
 
-from .models import USBCheckout
+from .models import USBDevice, USBDeviceType, USBCheckout
 from .api import usb_bp
 
 logger = logging.getLogger(__name__)
@@ -18,10 +18,10 @@ logger = logging.getLogger(__name__)
 
 class USBPlugin(BasePlugin):
     """
-    USB plugin - manages USB device checkouts.
-    
-    USB devices are stored in the machines table (machinetypeid=44).
-    This plugin provides checkout/checkin tracking.
+    USB plugin - manages USB device tracking and checkouts.
+
+    Standalone plugin for tracking USB flash drives, external drives,
+    and other portable storage devices with checkout/checkin functionality.
     """
     
     def __init__(self):
@@ -54,7 +54,7 @@ class USBPlugin(BasePlugin):
     
     def get_models(self) -> List[Type]:
         """Return list of SQLAlchemy model classes."""
-        return [USBCheckout]
+        return [USBDeviceType, USBDevice, USBCheckout]
     
     def init_app(self, app: Flask, db_instance) -> None:
         """Initialize plugin with Flask app."""