chore(db): use pseudo random naming for folder databases

internal/db/sqlite/sql/schema/main/00-folders.sql

@@ -0,0 +1,16 @@
+-- Copyright (C) 2025 The Syncthing Authors.
+--
+-- This Source Code Form is subject to the terms of the Mozilla Public
+-- License, v. 2.0. If a copy of the MPL was not distributed with this file,
+-- You can obtain one at https://mozilla.org/MPL/2.0/.
+
+-- folders map folder IDs as used by Syncthing to database folder indexes
+CREATE TABLE IF NOT EXISTS folders (
+    idx INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    folder_id TEXT NOT NULL UNIQUE COLLATE BINARY,
+    database_name TEXT COLLATE BINARY -- initially null
+) STRICT
+;
+-- The database_name is unique, when set
+CREATE INDEX IF NOT EXISTS folders_database_name ON folders (database_name) WHERE database_name IS NOT NULL
+;