Initial Ktor backend skeleton with ProtocolMessage DTO, REST and WebSocket

protocol/examples/command.json

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+{
+  "v": 1,
+  "id": "cmd-123",
+  "type": "command",
+  "ts": 1710000000,
+  "deviceId": "esp32-001",
+  "payload": {
+    "command": "setRelay",
+    "params": {
+      "state": true
+    }
+  }
+}

protocol/examples/event.json

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+{
+  "v": 1,
+  "id": "evt-123",
+  "type": "event",
+  "ts": 1710000003,
+  "deviceId": "esp32-001",
+  "payload": {
+    "event": "overheat",
+    "level": "warning",
+    "message": "Temperature too high"
+  }
+}

protocol/examples/response.json

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+{
+  "v": 1,
+  "id": "resp-123",
+  "type": "response",
+  "ts": 1710000001,
+  "deviceId": "esp32-001",
+  "payload": {
+    "requestId": "cmd-123",
+    "status": "ok",
+    "data": {}
+  }
+}

protocol/examples/telemetry.json

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+{
+  "v": 1,
+  "id": "tel-123",
+  "type": "telemetry",
+  "ts": 1710000002,
+  "deviceId": "esp32-001",
+  "payload": {
+    "voltage": 220.5,
+    "current": 1.2,
+    "temperature": 36.6
+  }
+}

protocol/schema.json

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+{
+  "type": "object",
+  "required": ["v", "id", "type", "ts", "deviceId", "payload"],
+  "properties": {
+    "v": { "type": "integer" },
+    "id": { "type": "string" },
+    "type": { "type": "string" },
+    "ts": { "type": "integer" },
+    "deviceId": { "type": "string" },
+    "payload": { "type": "object" }
+  }
+}