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>

.gitignore

@@ -0,0 +1,42 @@
+# ─── .NET ───
+[Bb]in/
+[Oo]bj/
+*.user
+*.suo
+.vs/
+
+# ─── C++ build ───
+industrial-comm/cpp/build/
+industrial-comm/build/
+
+# ─── Python ───
+mcp-server/.venv/
+.venv/
+venv/
+__pycache__/
+*.py[cod]
+.pytest_cache/
+.ruff_cache/
+.mypy_cache/
+
+# ─── Runtime / logs ───
+*.log
+/tmp/
+data/
+storage/kb/**
+!storage/kb/.gitkeep
+
+# ─── Generated P&ID geometry cache (재생성 가능, 대용량) ───
+mcp-server/storage/*_geo.json
+
+# ─── Local / machine-specific ───
+.claude/settings.local.json
+*.local.json
+appsettings.Development.json
+appsettings.Production.json
+
+# ─── OS / editor ───
+.DS_Store
+Thumbs.db
+*.swp
+*~