✨ feat: enhance admin API helpers with CRUD operations for collections and seed data management

- Added functions for creating, updating, deleting, and listing collection entries in admin API.
- Introduced seed data management for consistent test content across tests.
- Updated global setup and teardown processes to ensure seeded content is created and cleaned up.
- Refactored existing tests to utilize seeded content for improved reliability and maintainability.

playwright.config.ts

@@ -1,4 +1,5 @@
 import { defineConfig, devices } from "@playwright/test"
+import { TEST_BASE_URL } from "./tests/fixtures/test-constants"
 
 /**
  * Playwright configuration for tibi-svelte projects.
@@ -42,7 +43,7 @@ export default defineConfig({
 
     use: {
         /* Read from .env PROJECT_NAME or override via CODING_URL env var */
-        baseURL: process.env.CODING_URL || "https://localhost:3000",
+        baseURL: TEST_BASE_URL,
         headless: true,
         ignoreHTTPSErrors: true,
         trace: "on",