move openapi out of src dir

Adapted from #3579 by @gorkem-bwl. The openapi/registry, helpers, and
per-resource routes/* files are largely their work; this commit relocates
the directory out of src/ so the build-time generator code is not emitted
into dist/, and shifts spec generation from runtime to a build step.

Co-authored-by: gorkem-bwl <gorkem.cetin@bluewavelabs.ca>

server/scripts/buildOpenApi.ts

@@ -0,0 +1,10 @@
+import { writeFileSync } from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { getOpenApiSpec } from "../openapi/index.js";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const outPath = path.resolve(__dirname, "..", "openapi.json");
+
+writeFileSync(outPath, JSON.stringify(getOpenApiSpec(), null, 2) + "\n");
+console.log(`OpenAPI spec written to ${outPath}`);