chore: update OpenAPI documentation paths and add openapi.json file

- Copied openapi.json to the docs public folder for easier access.
- Updated paths in generated documentation files to reference the new location of openapi.json.
- Ensured all references to openapi.json are consistent across documentation files.

apps/docs/generate-docs.mjs

@@ -2,7 +2,7 @@ import { generateFiles } from "fumadocs-openapi";
 
 try {
 	void generateFiles({
-		input: ["../../public/openapi.json"],
+		input: ["./public/openapi.json"],
 		output: "./content/docs/api/generated",
 		per: "tag",
 		name: (tag, name) => {