core: setServerOperators, getUsageConditions api wip (#5145)

src/Simplex/Chat/Migrations/chat_schema.sql

@@ -593,13 +593,13 @@ CREATE TABLE app_settings(app_settings TEXT NOT NULL);
 CREATE TABLE server_operators(
   server_operator_id INTEGER PRIMARY KEY AUTOINCREMENT,
   server_operator_tag TEXT,
+  app_vendor INTEGER NOT NULL,
   trade_name TEXT NOT NULL,
   legal_name TEXT,
   server_domains TEXT,
   enabled INTEGER NOT NULL DEFAULT 1,
   role_storage INTEGER NOT NULL DEFAULT 1,
   role_proxy INTEGER NOT NULL DEFAULT 1,
-  accepted_conditions_commit TEXT,
   created_at TEXT NOT NULL DEFAULT(datetime('now')),
   updated_at TEXT NOT NULL DEFAULT(datetime('now'))
 );