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/bookmark_specifics.proto

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+// 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.
+//
+// Sync protocol datatype extension for bookmarks.
+
+// 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;
+
+import "unique_position.proto";
+
+// Corresponds to a single meta info key/value pair for a bookmark node.
+message MetaInfo {
+  optional string key = 1;
+  optional string value = 2;
+}
+
+// Properties of bookmark sync objects.
+message BookmarkSpecifics {
+  // URL of the bookmarked page (unset for folders).
+  optional string url = 1;
+  // PNG-encoded content of the favicon image (in practice 16x16, as determined
+  // by |kFaviconSize|). Empty if the bookmark has no favicon (which includes
+  // bookmark folders).
+  optional bytes favicon = 2;
+  // Contains legacy title which is truncated and may contain escaped symbols.
+  optional string legacy_canonicalized_title = 3;
+  // Corresponds to BookmarkNode::date_added() represented as microseconds since
+  // the Windows epoch.
+  optional int64 creation_time_us = 4;
+  // The URL of the favicon image encoded in field |favicon|. Note that there
+  // are various cases where this URL may be missing (field unset or empty) even
+  // if the |favicon| field (image content) is populated:
+  // 1. WebUI pages such as "chrome://bookmarks/" are missing a favicon URL but
+  //    they have a favicon.
+  // 2. Data generated by ancient clients (prior to M25) may not contain the
+  //    favicon URL.
+  // 3. If the favicon URL is too large (determined by |kMaxFaviconUrlSize|) it
+  //    may be omitted by clients to avoid running into the max-entity-size
+  //    limit. Most notably, this includes URLs prefixed with the data: scheme
+  //    that may encode the image content itself in the URL.
+  optional string icon_url = 5;
+  repeated MetaInfo meta_info = 6;
+  reserved 7;
+  reserved 8;
+  reserved 9;
+  // Introduced in M81, it represents a globally unique and immutable ID.
+  //
+  // If present, it must be the same as originator_client_item_id in lowercase,
+  // unless originator client item ID is not a valid GUID. In such cases (which
+  // is the case for bookmarks created before 2015), this GUID must match the
+  // value inferred from the combination of originator cache GUID and
+  // originator client item ID, see InferGuidForLegacyBookmark().
+  //
+  // If not present, the value can be safely inferred using the very same
+  // methods listed above.
+  optional string guid = 10;
+  // Contains full title as is. |legacy_canonicalized_title| is a prefix of
+  // |full_title| with escaped symbols.
+  optional string full_title = 11;
+  reserved 12;
+  reserved 13;
+  // Introduced in M94, represents the GUID (field |guid|) of the parent.
+  optional string parent_guid = 14;
+
+  // Introduced in M94, determines whether this entity represents a bookmark
+  // folder. This field is redundant to the similar field in SyncEntity. If this
+  // field in specifics is set, it takes precedence over the one in SyncEntity.
+  enum Type {
+    // |UNSPECIFIED| is relevant only for the case where the field is not set.
+    // M94 and above should not use this value.
+    UNSPECIFIED = 0;
+    URL = 1;
+    FOLDER = 2;
+  }
+  optional Type type = 15;
+
+  // Introduced in M94, determines ordering among siblings. This field is
+  // redundant to the similar field in SyncEntity. If this field in specifics is
+  // set, it takes precedence over the one in SyncEntity.
+  optional UniquePosition unique_position = 16;
+
+  // Introduced in M106, corresponds to BookmarkNode::date_last_used()
+  // represented as microseconds since the Windows epoch.
+  optional int64 last_used_time_us = 17;
+}