feat(lite): lite wallet foundation (inherited working-tree state)

Preserve the previously-uncommitted lite wallet implementation and related dev WIP
under version control:
- src/wallet/ lite services: client bridge, bridge runtime, connection, lifecycle,
  sync, gateway, result parsers, state mapper, artifact contract/resolver, refresh
  services, UI adapters, wallet_backend/capabilities. (Includes two small M1 fixes:
  lifecycle walletReady now parses the response; default chain name -> "main".)
- src/chat/ chat protocol; tests/fixtures/ (lite + hushchat); tools/hushchat_fixture_check.cpp;
  scripts/build-lite-backend-artifact.sh.
- Pre-existing modified app_network/security/wizard, network_refresh_service, sidebar,
  mining_tab, bootstrap dialog, and version headers captured as-is.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/services/network_refresh_service.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "chat/chat_protocol.h"
 #include "data/wallet_state.h"
 #include "refresh_scheduler.h"
 #include "rpc/rpc_worker.h"
@@ -159,6 +160,7 @@ public:
             std::string address;
             double value = 0.0;
             std::string memo;
+            std::size_t position = 0;
         };
         std::vector<Output> outgoing_outputs;
     };
@@ -180,6 +182,7 @@ public:
 
     struct TransactionRefreshResult {
         std::vector<TransactionInfo> transactions;
+        std::vector<chat::HushChatTransactionMetadata> hushChatMetadata;
         int blockHeight = -1;
         TransactionViewCache newViewTxEntries;
         std::size_t nextShieldedScanStartIndex = 0;
@@ -260,7 +263,8 @@ public:
                                                    std::set<std::string>& knownTxids,
                                                    const std::string& address,
                                                    const nlohmann::json& received,
-                                                   const std::set<std::string>& miningAddresses = {});
+                                                   const std::set<std::string>& miningAddresses = {},
+                                                   std::unordered_map<std::string, std::vector<chat::HushChatMemoOutput>>* chatMemoOutputs = nullptr);
     static TransactionViewCacheEntry parseViewTransactionCacheEntry(const nlohmann::json& viewTransaction);
     static void appendViewTransactionOutputs(std::vector<TransactionInfo>& transactions,
                                              const std::string& txid,