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>

src/Hc900Crawler/appsettings.json

@@ -0,0 +1,75 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore": "Warning",
+      "Microsoft.EntityFrameworkCore.Database.Command": "Warning",
+      "Hc900Crawler.Infrastructure.Hc900.Hc900HistoryService": "Warning",
+      "Hc900Crawler.Infrastructure.Control.FeedforwardSupervisor": "None",
+      "Hc900Crawler.Infrastructure.Control.FeedforwardConfigStore": "None",
+      "Hc900Crawler.Infrastructure.Kb.KbIngestWorker": "Warning",
+      "Hc900Crawler.Infrastructure.Kb.KbStartupService": "Warning"
+    },
+    "Console": {
+      "LogLevel": {
+        "Default": "Information",
+        "Microsoft.EntityFrameworkCore": "Warning",
+        "Hc900Crawler.Infrastructure.Control.FeedforwardSupervisor": "None"
+      },
+      "FormatterName": "simple",
+      "FormatterOptions": {
+        "TimestampFormat": "HH:mm:ss "
+      }
+    }
+  },
+  "AllowedHosts": "*",
+  "Cors": {
+    "AllowedOrigins": [ "*" ]
+  },
+  "ConnectionStrings": {
+    "DefaultConnection": "Host=localhost;Port=5432;Database=iiot_platform;Username=postgres;Password=postgres;Search Path=hc900"
+  },
+  "Hc900": {
+    "GatewayAddress": "http://localhost:50051",
+    "PollIntervalMs": 1000
+  },
+  "PidControllers": {
+    "Enabled": true
+  },
+  "Feedforward": {
+    "SimOverrideEnabled": true
+  },
+  "McpServer": {
+    "WorkingDirectory": "../../mcp-server"
+  },
+  "DocBrowser": {
+    "Root": "/home/windpacer/projects/hc900_ax",
+    "MaxTextBytes": 2097152,
+    "MaxUploadBytes": 52428800
+  },
+  "Kb": {
+    "QdrantUrl": "http://localhost:6333",
+    "VectorSize": 768,
+    "StorageRoot": "../../storage/kb",
+    "AdminInitialPassword": "admin",
+    "AdminSessionMinutes": 60,
+    "WorkerPollIntervalSeconds": 2,
+    "MaxAttempts": 3,
+    "Throttle": {
+      "MaxFailAttempts": 5,
+      "FailWindowMinutes": 5,
+      "LockoutMinutes": 15
+    }
+  },
+  "Kestrel": {
+    "Endpoints": {
+      "Http": {
+        "Url": "http://0.0.0.0:5000"
+      }
+    },
+    "Limits": {
+      "MaxRequestBodySize": 104857600
+    }
+  }
+}