feat(clickTtHttpPageRoutes): implement form action rewriting and proxy for POST requests

- Added a new function to rewrite form actions in HTML to route submissions through the proxy, enhancing logging for login actions.
- Implemented a POST endpoint for the proxy to handle form submissions, including validation for target URLs and forwarding requests with appropriate headers.
- Enhanced error handling and response management for the new proxy functionality, ensuring robust interaction with external services.

backend/services/clickTtHttpPageService.js

@@ -99,27 +99,32 @@ async function fetchWithLogging(options) {
     clubIdParam = null,
     userId = null,
     method = 'GET',
+    body = null,
+    headers: customHeaders = {},
   } = options;
 
   const baseDomain = extractBaseDomain(url);
   const startTime = Date.now();
 
+  const headers = {
+    'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
+    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
+    'Accept-Language': 'de,en-US;q=0.7,en;q=0.3',
+    ...customHeaders,
+  };
+
   try {
-    const response = await fetch(url, {
-      method,
-      headers: {
-        'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
-        'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
-        'Accept-Language': 'de,en-US;q=0.7,en;q=0.3',
-      },
-      timeout: 30000,
-    });
+    const fetchOpts = { method, headers, timeout: 30000 };
+    if (body && (method === 'POST' || method === 'PUT')) {
+      fetchOpts.body = body;
+    }
+    const response = await fetch(url, fetchOpts);
 
     const executionTimeMs = Date.now() - startTime;
     const contentType = response.headers.get('content-type') || null;
-    const body = await response.text();
+    const responseBody = await response.text();
     const success = response.ok;
-    const snippet = createResponseSnippet(body);
+    const snippet = createResponseSnippet(responseBody);
 
     await HttpPageFetchLog.create({
       userId,
@@ -143,8 +148,9 @@ async function fetchWithLogging(options) {
       success,
       status: response.status,
       contentType,
-      body,
+      body: responseBody,
       executionTimeMs,
+      headers: response.headers,
     };
   } catch (error) {
     const executionTimeMs = Date.now() - startTime;