feat: support custom server deployment drafts

plugins/manifests/game-plugin.manifest.schema.json

@@ -26,7 +26,12 @@
         "type": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]*$", "maxLength": 80 },
         "displayName": { "type": "string", "minLength": 1, "maxLength": 80 },
         "supportedOS": { "type": "array", "items": { "enum": ["windows", "linux", "darwin"] } },
-        "createFormSchema": { "$ref": "#/$defs/relativeJsonRef" }
+        "createFormSchema": { "$ref": "#/$defs/relativeJsonRef" },
+        "createFields": {
+          "type": "array",
+          "maxItems": 32,
+          "items": { "$ref": "#/$defs/pluginCreateField" }
+        }
       }
     },
     "bridge": {
@@ -191,6 +196,20 @@
     }
   },
   "$defs": {
+    "pluginCreateField": {
+      "type": "object",
+      "required": ["key", "label", "type"],
+      "additionalProperties": false,
+      "properties": {
+        "key": { "type": "string", "pattern": "^[a-zA-Z][a-zA-Z0-9_]*$", "maxLength": 80 },
+        "label": { "type": "string", "minLength": 1, "maxLength": 60 },
+        "type": { "enum": ["text", "number", "boolean", "select", "port"] },
+        "required": { "type": "boolean" },
+        "defaultValue": { "type": "string", "maxLength": 256 },
+        "options": { "type": "array", "maxItems": 32, "uniqueItems": true, "items": { "type": "string", "minLength": 1, "maxLength": 120 } },
+        "configKey": { "type": "string", "pattern": "^[a-zA-Z][a-zA-Z0-9_]*$", "maxLength": 80 }
+      }
+    },
     "gameClientBridgeManifest": {
       "type": "object",
       "required": ["commands", "snapshots", "commandRetentionSeconds", "maxCommands"],