Fix model-controller mismatches and routing issues

- ticket: add user_id, priority, category fields; fix _serialize_ticket -> _serialize
- package: fix is_active -> active (Odoo auto-filter), remove invalid entity_id filter
- walkthrough: add sequence field; fix controller to use name/content instead of title/steps
- users: fix encoach_user_type -> encoach_type, encoach_entity_id -> entity_rel_ids.entity_id
- generation: use EncoachGenerationService class instead of nonexistent ORM model,
  fix /api/exam/level/ route conflict (separate GET and POST URLs)

Made-with: Cursor

encoach_ticket/models/ticket.py

@@ -5,10 +5,18 @@ class EncoachTicket(models.Model):
     _name = "encoach.ticket"
     _description = "EnCoach Support Ticket"
 
+    user_id = fields.Many2one(
+        "res.users", string="Reporter", ondelete="set null", index=True,
+    )
     reporter_name = fields.Char()
     reporter_email = fields.Char()
     subject = fields.Char(required=True)
     description = fields.Text()
+    priority = fields.Selection(
+        [("low", "Low"), ("medium", "Medium"), ("high", "High")],
+        default="medium",
+    )
+    category = fields.Char()
     ticket_type = fields.Selection(
         [
             ("feedback", "Feedback"),
@@ -37,11 +45,15 @@ class EncoachTicket(models.Model):
         self.ensure_one()
         return {
             "id": self.id,
+            "_id": str(self.id),
+            "userId": str(self.user_id.id) if self.user_id else None,
             "reporterName": self.reporter_name or "",
             "reporterEmail": self.reporter_email or "",
             "subject": self.subject or "",
             "description": self.description or "",
             "type": self.ticket_type or "",
+            "priority": self.priority or "medium",
+            "category": self.category or "",
             "status": self.status,
             "examInformation": self.exam_information,
             "assignedTo": (