Port Brave Sync server to Rust

Use SQLite for persistence and generate Rust protobuf bindings at build time.

Add Docker image support for containerized deployment.

Co-Authored-By: codex <[email protected]>

schema/protobuf/sync_pb/favicon_tracking_specifics.proto

@@ -0,0 +1,33 @@
+// Copyright 2012 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// DEPRECATED: This data type is no longer synced.
+// TODO(crbug.com/978775): Remove once the file is no longer used by the server.
+// Sync protocol datatype extension for the favicon tracking type.
+
+// If you change or add any fields in this file, update proto_visitors.h and
+// potentially proto_enum_conversions.{h, cc}.
+
+syntax = "proto2";
+
+option go_package = "./sync_pb";
+
+option java_multiple_files = true;
+option java_package = "org.chromium.components.sync.protocol";
+
+option optimize_for = LITE_RUNTIME;
+
+package sync_pb;
+
+// Tracking info for of favicon images. These control expiration of images
+// from sync based on recency, bookmark state, etc.
+message FaviconTrackingSpecifics {
+  // The url of the favicon image.
+  optional string favicon_url = 1;
+  // The last time a page using this favicon was visited (in milliseconds
+  // since linux epoch).
+  optional int64 last_visit_time_ms = 3;
+  // Whether this favicon is currently bookmarked or not.
+  optional bool is_bookmarked = 4;
+}