✨ 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.

tests/fixtures/test-constants.ts

@@ -1,3 +1,6 @@
+import fs from "node:fs"
+import path from "node:path"
+
 /**
  * Zentrale Test-Konstanten für alle Tests.
  *
@@ -14,8 +17,48 @@ export const TEST_USER = {
     lastName: "E2E",
 } as const
 
-export const ADMIN_TOKEN = process.env.ADMIN_TOKEN || "CHANGE_ME"
+function loadAdminTokenFromEnvFile(): string | undefined {
+    const envFilePath = path.resolve(process.cwd(), "api/config.yml.env")
+    if (!fs.existsSync(envFilePath)) return undefined
+
+    const raw = fs.readFileSync(envFilePath, "utf8")
+    const line = raw
+        .split(/\r?\n/)
+        .find((entry) => entry.startsWith("ADMIN_TOKEN=") && entry.trim().length > "ADMIN_TOKEN=".length)
+
+    return line ? line.slice("ADMIN_TOKEN=".length).trim() : undefined
+}
+
+function loadProjectEnvValue(key: string): string | undefined {
+    const envFilePath = path.resolve(process.cwd(), ".env")
+    if (!fs.existsSync(envFilePath)) return undefined
+
+    const raw = fs.readFileSync(envFilePath, "utf8")
+    const prefix = `${key}=`
+    const line = raw.split(/\r?\n/).find((entry) => entry.startsWith(prefix) && entry.trim().length > prefix.length)
+    if (!line) return undefined
+
+    return line.slice(prefix.length).trim()
+}
+
+export const ADMIN_TOKEN = process.env.ADMIN_TOKEN || loadAdminTokenFromEnvFile() || "CHANGE_ME"
 export const API_BASE = "/api"
+export const TEST_BASE_URL = process.env.CODING_URL || loadProjectEnvValue("CODING_URL") || "http://localhost:3000"
+
+export const SEEDED_TEST_CONTENT = {
+    home: {
+        translationKey: "pw-e2e-home",
+        path: "/playwright-e2e-home",
+    },
+    contact: {
+        translationKey: "pw-e2e-contact",
+        path: "/playwright-e2e-contact",
+    },
+    inactive: {
+        translationKey: "pw-e2e-inactive",
+        path: "/playwright-e2e-inactive",
+    },
+} as const
 
 export const BASIC_AUTH = {
     username: process.env.BASIC_AUTH_USER || "web",