feat: Implement gRPC ROM service for remote manipulation

- Added `RomServiceImpl` class to facilitate remote ROM operations, including reading/writing ROM data, managing versions, and submitting proposals.
- Integrated gRPC support for real-time collaboration and remote access to ROM functionalities.
- Updated `README.md` to document the new gRPC ROM service and its capabilities.
- Enhanced CMake configuration to include new source files for the gRPC implementation and related services.

src/app/net/rom_service_impl.h

@@ -0,0 +1,170 @@
+#ifndef YAZE_APP_NET_ROM_SERVICE_IMPL_H_
+#define YAZE_APP_NET_ROM_SERVICE_IMPL_H_
+
+#include <memory>
+#include <string>
+
+#include "absl/status/status.h"
+#include "absl/status/statusor.h"
+
+#ifdef YAZE_WITH_GRPC
+#include <grpcpp/grpcpp.h>
+#include "protos/rom_service.grpc.pb.h"
+#endif
+
+#include "app/rom.h"
+#include "app/net/rom_version_manager.h"
+
+namespace yaze {
+namespace app {
+namespace net {
+
+#ifdef YAZE_WITH_GRPC
+
+/**
+ * @brief gRPC service implementation for remote ROM manipulation
+ * 
+ * Enables remote clients (like z3ed CLI) to:
+ * - Read/write ROM data
+ * - Submit proposals for collaborative editing
+ * - Manage ROM versions and snapshots
+ * - Query ROM structures (overworld, dungeons, sprites)
+ * 
+ * Thread-safe and designed for concurrent access.
+ */
+class RomServiceImpl final : public proto::RomService::Service {
+ public:
+  /**
+   * @brief Configuration for the ROM service
+   */
+  struct Config {
+    bool require_approval_for_writes = true;  // Submit writes as proposals
+    bool enable_version_management = true;    // Auto-snapshot before changes
+    int max_read_size_bytes = 1024 * 1024;    // 1MB max per read
+    bool allow_raw_rom_access = true;         // Allow direct byte access
+  };
+  
+  /**
+   * @brief Construct ROM service
+   * @param rom Pointer to ROM instance (not owned)
+   * @param version_mgr Pointer to version manager (not owned, optional)
+   * @param approval_mgr Pointer to approval manager (not owned, optional)
+   */
+  RomServiceImpl(Rom* rom,
+                 RomVersionManager* version_mgr = nullptr,
+                 ProposalApprovalManager* approval_mgr = nullptr);
+  
+  ~RomServiceImpl() override = default;
+  
+  // Initialize with configuration
+  void SetConfig(const Config& config) { config_ = config; }
+  
+  // =========================================================================
+  // Basic ROM Operations
+  // =========================================================================
+  
+  grpc::Status ReadBytes(
+      grpc::ServerContext* context,
+      const proto::ReadBytesRequest* request,
+      proto::ReadBytesResponse* response) override;
+  
+  grpc::Status WriteBytes(
+      grpc::ServerContext* context,
+      const proto::WriteBytesRequest* request,
+      proto::WriteBytesResponse* response) override;
+  
+  grpc::Status GetRomInfo(
+      grpc::ServerContext* context,
+      const proto::GetRomInfoRequest* request,
+      proto::GetRomInfoResponse* response) override;
+  
+  // =========================================================================
+  // Overworld Operations
+  // =========================================================================
+  
+  grpc::Status ReadOverworldMap(
+      grpc::ServerContext* context,
+      const proto::ReadOverworldMapRequest* request,
+      proto::ReadOverworldMapResponse* response) override;
+  
+  grpc::Status WriteOverworldTile(
+      grpc::ServerContext* context,
+      const proto::WriteOverworldTileRequest* request,
+      proto::WriteOverworldTileResponse* response) override;
+  
+  // =========================================================================
+  // Dungeon Operations
+  // =========================================================================
+  
+  grpc::Status ReadDungeonRoom(
+      grpc::ServerContext* context,
+      const proto::ReadDungeonRoomRequest* request,
+      proto::ReadDungeonRoomResponse* response) override;
+  
+  grpc::Status WriteDungeonTile(
+      grpc::ServerContext* context,
+      const proto::WriteDungeonTileRequest* request,
+      proto::WriteDungeonTileResponse* response) override;
+  
+  // =========================================================================
+  // Sprite Operations
+  // =========================================================================
+  
+  grpc::Status ReadSprite(
+      grpc::ServerContext* context,
+      const proto::ReadSpriteRequest* request,
+      proto::ReadSpriteResponse* response) override;
+  
+  // =========================================================================
+  // Proposal System
+  // =========================================================================
+  
+  grpc::Status SubmitRomProposal(
+      grpc::ServerContext* context,
+      const proto::SubmitRomProposalRequest* request,
+      proto::SubmitRomProposalResponse* response) override;
+  
+  grpc::Status GetProposalStatus(
+      grpc::ServerContext* context,
+      const proto::GetProposalStatusRequest* request,
+      proto::GetProposalStatusResponse* response) override;
+  
+  // =========================================================================
+  // Version Management
+  // =========================================================================
+  
+  grpc::Status CreateSnapshot(
+      grpc::ServerContext* context,
+      const proto::CreateSnapshotRequest* request,
+      proto::CreateSnapshotResponse* response) override;
+  
+  grpc::Status RestoreSnapshot(
+      grpc::ServerContext* context,
+      const proto::RestoreSnapshotRequest* request,
+      proto::RestoreSnapshotResponse* response) override;
+  
+  grpc::Status ListSnapshots(
+      grpc::ServerContext* context,
+      const proto::ListSnapshotsRequest* request,
+      proto::ListSnapshotsResponse* response) override;
+  
+ private:
+  Config config_;
+  Rom* rom_;  // Not owned
+  RomVersionManager* version_mgr_;  // Not owned, may be null
+  ProposalApprovalManager* approval_mgr_;  // Not owned, may be null
+  
+  // Helper to check if ROM is loaded
+  grpc::Status ValidateRomLoaded();
+  
+  // Helper to create snapshot before write operations
+  absl::Status MaybeCreateSnapshot(const std::string& description);
+};
+
+#endif  // YAZE_WITH_GRPC
+
+}  // namespace net
+}  // namespace app
+}  // namespace yaze
+
+#endif  // YAZE_APP_NET_ROM_SERVICE_IMPL_H_