fix(api-docs): rename openapi.json route dir to spec (dot breaks Next.js routing)

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

src/app/api-docs/route.ts

@@ -21,7 +21,7 @@ export async function GET(req: Request) {
   <script src="https://unpkg.com/swagger-ui-dist@5/swagger-ui-standalone-preset.js"></script>
   <script>
     SwaggerUIBundle({
-      url: "${base}/api/v1/openapi.json",
+      url: "${base}/api/v1/spec",
       dom_id: "#swagger-ui",
       presets: [SwaggerUIBundle.presets.apis, SwaggerUIStandalonePreset],
       layout: "StandaloneLayout",