Self-hosted employee directory (in-app management + CSV import)

Most sites have no external HR database, so add a self-hosted directory mode.

- New employee_directory_mode setting: 'external' (default; read a separate HR
  DB, unchanged) or 'selfhosted' (app-owned table).
- DirectoryEmployee model + directoryemployees table (migration 7d16). to_dict
  emits the same keys the external contract uses (SSO/First_Name/...), so both
  modes share one response shape and the frontend is unchanged.
- Employee search / single / batch lookup branch on the mode.
- Self-hosted-only management endpoints: list, create, update, delete, and CSV
  import (upsert by SSO). Guarded so they only work in self-hosted mode.
- EmployeeDirectory.vue management page (Settings > Locations & Organization):
  table + search + pagination, add/edit/delete, CSV import (file or paste).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

plugins/employees/models/directory_employee.py

@@ -0,0 +1,33 @@
+"""Self-hosted employee directory.
+
+For sites with no external HR database. When employee_directory_mode is
+'selfhosted', the employee lookup APIs read this app-owned table instead of the
+external directory, and the directory is managed in-app (CRUD + CSV import).
+
+to_dict emits the same keys the external contract returns (SSO, First_Name,
+Last_Name, Team, Role, Picture) so the frontend and both modes share one shape.
+"""
+
+from shopdb.api import db
+
+
+class DirectoryEmployee(db.Model):
+    __tablename__ = 'directoryemployees'
+
+    sso = db.Column(db.Integer, primary_key=True, autoincrement=False)
+    firstname = db.Column(db.String(100), nullable=False)
+    lastname = db.Column(db.String(100), nullable=False)
+    team = db.Column(db.String(100))
+    role = db.Column(db.String(100))
+    picture = db.Column(db.String(255))
+
+    def to_dict(self):
+        # Keys match the external employees contract the frontend consumes.
+        return {
+            'SSO': self.sso,
+            'First_Name': self.firstname,
+            'Last_Name': self.lastname,
+            'Team': self.team,
+            'Role': self.role,
+            'Picture': self.picture,
+        }