fix(fusion_plating_shopfloor): import fields in manager_controller

The Phase 4 endpoints (/fp/manager/funnel, approval_inbox, at_risk)
all use fields.Datetime.now() but the controller only imported http
+ request. Hitting the Workflow Funnel tab on Manager Desk threw:

  NameError: name 'fields' is not defined

Funnel auto-loads on dashboard mount → infinite spinner + 'Funnel:
Odoo Server Error' notification. Same bug would have hit at_risk
and approval_inbox on first navigation.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_shopfloor/controllers/manager_controller.py

@@ -21,7 +21,7 @@ import logging
 
 from markupsafe import Markup
 
-from odoo import http
+from odoo import fields, http
 from odoo.addons.fusion_plating.models.fp_tz import fp_format
 from odoo.http import request