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/experiments_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.
+
+// This was a sync protocol datatype extension for experimental feature flags,
+// also exposed via a separate ExperimentStatus API. As of M75, the datatype
+// isn't used anymore, and as of M81 the ExperimentStatus API isn't used anymore
+// either (see crbug.com/939819 and crbug.com/1009361). The proto definition
+// needs to stay around for now so that the server can continue supporting these
+// old clients .
+
+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;
+
+// A flag to enable support for keystore encryption.
+message KeystoreEncryptionFlags {
+  optional bool enabled = 1;
+}
+
+// Whether history delete directives are enabled.
+message HistoryDeleteDirectives {
+  optional bool enabled = 1;
+}
+
+// Whether this client should cull (delete) expired autofill
+// entries when autofill sync is enabled.
+message AutofillCullingFlags {
+  optional bool enabled = 1;
+}
+
+// Whether the favicon sync datatypes are enabled, and what parameters
+// they should operate under.
+message FaviconSyncFlags {
+  optional bool enabled = 1;
+  optional int32 favicon_sync_limit = 2 [default = 200];
+}
+
+// Flags for enabling the experimental no-precommit GU feature.
+message PreCommitUpdateAvoidanceFlags {
+  optional bool enabled = 1;
+}
+
+// Flags for enabling the GCM feature.
+message GcmChannelFlags {
+  optional bool enabled = 1;
+}
+
+// Flags for enabling the experimental enhanced bookmarks feature.
+message EnhancedBookmarksFlags {
+  optional bool enabled = 1;
+  optional string extension_id = 2;
+}
+
+// Flags for enabling GCM channel for invalidations.
+message GcmInvalidationsFlags {
+  optional bool enabled = 1;
+}
+
+// Flags for enabling wallet data syncing.
+message WalletSyncFlags {
+  optional bool enabled = 1;
+}
+
+// Contains one flag or set of related flags.  Each node of the experiments type
+// will have a unique_client_tag identifying which flags it contains.  By
+// convention, the tag name should match the sub-message name.
+message ExperimentsSpecifics {
+  optional KeystoreEncryptionFlags keystore_encryption = 1;
+  optional HistoryDeleteDirectives history_delete_directives = 2;
+  optional AutofillCullingFlags autofill_culling = 3;
+  optional FaviconSyncFlags favicon_sync = 4;
+  optional PreCommitUpdateAvoidanceFlags pre_commit_update_avoidance = 5;
+  optional GcmChannelFlags gcm_channel = 6;
+  // No longer used as of M43.
+  optional EnhancedBookmarksFlags obsolete_enhanced_bookmarks = 7;
+  // No longer used as of M72.
+  optional GcmInvalidationsFlags gcm_invalidations = 8;
+  // No longer used as of M51.
+  optional WalletSyncFlags obsolete_wallet_sync = 9;
+}