refactor: rename the project to JerapahFlow (jerapah-flow)

Update package names, env vars, cookie, and default ntfy topics while keeping SCRUNNER_* fallbacks.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/server/src/api/auth.js

@@ -1,7 +1,7 @@
 import bcrypt from "bcryptjs";
 import * as store from "../../store.js";
 
-export const COOKIE = "scrunner_token";
+export const COOKIE = "jerapah_flow_token";
 export const OPEN_API_ROUTES = new Set([
   "GET /auth/bootstrap",
   "POST /auth/register",