Initial commit: HC900 Crawler

Honeywell HC900을 Modbus TCP로 직접 폴링 → gRPC → C# 크롤러 → PostgreSQL.
기존 Experion OPC UA 데이터 경로를 HC900 직접 통신으로 대체.

- industrial-comm/cpp: C++ Modbus 게이트웨이 (gRPC 서버)
- src: C# .NET 8 ASP.NET Core 크롤러 + 웹 UI (3-Layer)
- mcp-server: Python FastMCP (RAG/NL2SQL/P&ID)
- 다중 컨트롤러(N-Controller) 지원

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

industrial-comm/cpp/CMakeLists.txt

@@ -0,0 +1,96 @@
+cmake_minimum_required(VERSION 3.20)
+project(comm_core)
+
+add_library(comm_core SHARED)
+
+target_sources(comm_core
+    PRIVATE
+        src/controller.cpp
+        src/codec.cpp
+)
+
+target_include_directories(comm_core
+    PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}/include
+)
+
+target_compile_options(comm_core
+    PRIVATE
+        -Wall -Wextra -Wpedantic
+)
+
+# ─── HC900 Gateway ───
+
+set(GRPC_DIR /tmp/grpc_local)
+set(ABSL_DIR /tmp/absl_local)
+set(PROTO_GEN_DIR ${CMAKE_CURRENT_SOURCE_DIR}/gen)
+
+add_executable(hc900_gateway)
+
+target_sources(hc900_gateway
+    PRIVATE
+        src/gateway.cpp
+        src/modbus_tcp.cpp
+        ${PROTO_GEN_DIR}/modbus_gateway.pb.cc
+        ${PROTO_GEN_DIR}/modbus_gateway.grpc.pb.cc
+)
+
+target_include_directories(hc900_gateway
+    PRIVATE
+        ${CMAKE_CURRENT_SOURCE_DIR}/include
+        ${PROTO_GEN_DIR}
+        ${GRPC_DIR}/usr/include
+        ${ABSL_DIR}/usr/include
+)
+
+target_link_directories(hc900_gateway
+    PRIVATE
+        ${GRPC_DIR}/usr/lib/aarch64-linux-gnu
+        ${ABSL_DIR}/usr/lib/aarch64-linux-gnu
+        /usr/lib/aarch64-linux-gnu
+        /lib/aarch64-linux-gnu
+)
+
+target_link_libraries(hc900_gateway
+    PRIVATE
+        comm_core
+        grpc++
+        grpc
+        gpr
+        upb
+        address_sorting
+        protobuf
+        absl_synchronization
+        absl_status
+        absl_cord
+        absl_cord_internal
+        absl_cordz_info
+        absl_cordz_handle
+        absl_cordz_functions
+        absl_cordz_sample_token
+        absl_hashtablez_sampler
+        absl_exponential_biased
+        absl_raw_hash_set
+        absl_hash
+        absl_city
+        absl_low_level_hash
+        absl_int128
+        absl_raw_logging_internal
+        absl_log_severity
+        absl_spinlock_wait
+        absl_malloc_internal
+        absl_throw_delegate
+        absl_time
+        absl_time_zone
+        absl_strings
+        absl_strings_internal
+        absl_base
+        pthread
+        rt
+        dl
+)
+
+target_compile_options(hc900_gateway
+    PRIVATE
+        -Wall -Wextra -Wpedantic
+)