Add settings page for managing forecasting API key and URL via UI

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/ajv/lib/vocabularies/validation/limitProperties.ts

@@ -0,0 +1,26 @@
+import type {CodeKeywordDefinition, KeywordErrorDefinition} from "../../types"
+import type {KeywordCxt} from "../../compile/validate"
+import {_, str, operators} from "../../compile/codegen"
+
+const error: KeywordErrorDefinition = {
+  message({keyword, schemaCode}) {
+    const comp = keyword === "maxProperties" ? "more" : "fewer"
+    return str`must NOT have ${comp} than ${schemaCode} properties`
+  },
+  params: ({schemaCode}) => _`{limit: ${schemaCode}}`,
+}
+
+const def: CodeKeywordDefinition = {
+  keyword: ["maxProperties", "minProperties"],
+  type: "object",
+  schemaType: "number",
+  $data: true,
+  error,
+  code(cxt: KeywordCxt) {
+    const {keyword, data, schemaCode} = cxt
+    const op = keyword === "maxProperties" ? operators.GT : operators.LT
+    cxt.fail$data(_`Object.keys(${data}).length ${op} ${schemaCode}`)
+  },
+}
+
+export default def