Fix null→false, stock seed data, action_get on model, FK order

- Normalize null DB values to false (Odoo convention) in web_search_read
  and web_read responses
- Seed stock reference data: 6 locations, 1 warehouse, 3 picking types
- Fix FK order: warehouse must be created before picking types
- Move action_get from hardcoded dispatcher to res.users RegisterMethod
- Add action_res_users_my (ID 103) to seedActions
- Remove hardcoded action_get case from dispatchORM

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

addons/base/models/res_users.go

@@ -61,6 +61,23 @@ func initResUsers() {
 			Help: "External user with limited access (portal/public)",
 		}),
 	)
+
+	// -- Methods --
+
+	// action_get returns the "Change My Preferences" action for the current user.
+	// Mirrors: odoo/addons/base/models/res_users.py Users.action_get()
+	m.RegisterMethod("action_get", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
+		return map[string]interface{}{
+			"type":      "ir.actions.act_window",
+			"name":      "Change My Preferences",
+			"res_model": "res.users",
+			"view_mode": "form",
+			"views":     [][]interface{}{{false, "form"}},
+			"target":    "new",
+			"res_id":    rs.Env().UID(),
+			"context":   map[string]interface{}{},
+		}, nil
+	})
 }
 
 // initResGroups registers the res.groups model.