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/printer_specifics.proto

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+// Copyright 2016 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 printer data.
+
+// 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;
+
+// User PPD configuration
+message PrinterPPDReference {
+  // Url for user provided file.  Overrides other fields.
+  optional string user_supplied_ppd_url = 1;
+
+  // Retired fields
+  optional string effective_manufacturer = 2 [deprecated = true];
+  optional string effective_model = 3 [deprecated = true];
+
+  // String identifying the type of printer, used to look up a ppd to drive the
+  // printer.
+  optional string effective_make_and_model = 4;
+
+  // True if the printer should be automatically configured, false otherwise.
+  optional bool autoconf = 5 [default = false];
+}
+
+message PrinterSpecifics {
+  // Printer record GUID
+  optional string id = 1;
+
+  // User visible name.  Any string.
+  optional string display_name = 2;
+
+  // User visible description.  Any string.
+  optional string description = 3;
+
+  // Printer manufacturer.  Should be a known manufacturuer.
+  // Deprecated in favor of make_and_model.
+  optional string manufacturer = 4 [deprecated = true];
+
+  // Printer model.  Should match a known model for the manufacturer.
+  // Deprecated in favor of make_and_model.
+  optional string model = 5 [deprecated = true];
+
+  // Universal Resource Identifier for the printer on the network.  usb:// will
+  // be the scheme for USB printers.  Example
+  // ipp://address.example:port/queue/queue/queue.
+  optional string uri = 6;
+
+  // Universally Unique Identifier provided by the printer.  Used for unique
+  // identification of printers in a zeroconf environment.
+  optional string uuid = 7;
+
+  // PPDData was deprecated in favor of PPDReference format.
+  optional bytes ppd = 8 [deprecated = true];
+
+  // Structure representing the user's ppd configuration.
+  optional PrinterPPDReference ppd_reference = 9;
+
+  // Timestamp when printer was last updated.
+  optional int64 updated_timestamp = 10;
+
+  // The make and model of the printer in one string.  The typical arrangement
+  // for this is '<make> <model>'.  This aligns with the typical formatting of
+  // the IPP attribute printer-make-and-model.
+  optional string make_and_model = 11;
+
+  // Universal Resource Identifier for the print server on the network.  This
+  // will only be populated if the printer is from a print server.  Example
+  // ipp://address.example:port/
+  optional string print_server_uri = 12;
+}