Add OpenAPI specification and generation command

apps/api/swagger.json

@@ -0,0 +1,82 @@
+{
+  "openapi": "3.1.0",
+  "info": {
+    "title": "yet-another-nginx-proxy-manager",
+    "description": "",
+    "license": {
+      "name": ""
+    },
+    "version": "0.1.0"
+  },
+  "paths": {
+    "/api/health/info": {
+      "get": {
+        "tags": [
+          "crate::routes::api::health::info"
+        ],
+        "operationId": "get_health_info",
+        "parameters": [
+          {
+            "name": "id",
+            "in": "path",
+            "description": "Pet database id to get Pet for",
+            "required": true,
+            "schema": {
+              "type": "integer",
+              "format": "int64",
+              "minimum": 0
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Health information retrieved successfully",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/HealthInfo"
+                }
+              }
+            }
+          },
+          "404": {
+            "description": "Health information not found"
+          }
+        }
+      }
+    }
+  },
+  "components": {
+    "schemas": {
+      "HealthInfo": {
+        "type": "object",
+        "required": [
+          "status",
+          "version",
+          "up_since"
+        ],
+        "properties": {
+          "errors": {
+            "type": [
+              "array",
+              "null"
+            ],
+            "items": {
+              "type": "string"
+            }
+          },
+          "status": {
+            "type": "string"
+          },
+          "up_since": {
+            "type": "string",
+            "format": "date-time"
+          },
+          "version": {
+            "type": "string"
+          }
+        }
+      }
+    }
+  }
+}