2fa work slight refactor

- use existing access mechanisms for validation
- adds swagger/schema and validation of incoming payload

backend/schema/paths/users/userID/2fa/get.json

@@ -0,0 +1,46 @@
+{
+	"operationId": "getUser2faStatus",
+	"summary": "Get user 2fa Status",
+	"tags": ["users"],
+	"security": [
+		{
+			"bearerAuth": []
+		}
+	],
+	"responses": {
+		"200": {
+			"description": "200 response",
+			"content": {
+				"application/json": {
+					"examples": {
+						"default": {
+							"value": [
+								{
+									"enabled": false,
+									"backup_codes_remaining": 0
+								}
+							]
+						}
+					},
+					"schema": {
+						"type": "object",
+						"additionalProperties": false,
+						"required": ["enabled", "backup_codes_remaining"],
+						"properties": {
+							"enabled": {
+								"type": "boolean",
+								"description": "Is 2FA enabled for this user",
+								"example": true
+							},
+							"backup_codes_remaining": {
+								"type": "integer",
+								"description": "Number of remaining backup codes for this user",
+								"example": 5
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+}