Flatten repo structure: move crawler/ to root, remove vqa/ and immoweb/

The crawler subdirectory was the only active project. Moving it to the
repo root simplifies paths and removes the unnecessary nesting. The
vqa/ and immoweb/ directories were legacy/unused and have been removed.

Updated .drone.yml, .gitignore, .claude/ docs, and skills to reflect
the new flat structure.

crawler/frontend/src/services/apiClient.ts

@@ -1,61 +0,0 @@
-// Generic API client with authentication
-
-import type { AuthUser } from '@/auth/types';
-import { ApiError } from '@/types';
-
-export interface RequestOptions {
-  method?: 'GET' | 'POST' | 'PUT' | 'DELETE';
-  params?: Record<string, string | number | boolean | Date | undefined>;
-}
-
-/**
- * Build query string from parameters object
- */
-function buildQueryString(params: Record<string, string | number | boolean | Date | undefined>): string {
-  const queryString = new URLSearchParams();
-
-  for (const [key, value] of Object.entries(params)) {
-    if (value !== undefined && value !== null && value !== '') {
-      if (value instanceof Date) {
-        queryString.append(key, value.toISOString());
-      } else {
-        queryString.append(key, String(value));
-      }
-    }
-  }
-
-  return queryString.toString();
-}
-
-/**
- * Generic authenticated API request
- */
-export async function apiRequest<T>(
-  user: AuthUser,
-  endpoint: string,
-  options: RequestOptions = {}
-): Promise<T> {
-  const { method = 'GET', params } = options;
-
-  let url = endpoint;
-  if (params) {
-    const queryString = buildQueryString(params);
-    if (queryString) {
-      url = `${endpoint}?${queryString}`;
-    }
-  }
-
-  const response = await fetch(url, {
-    method,
-    headers: {
-      Authorization: `Bearer ${user.accessToken}`,
-      'Content-Type': 'application/json',
-    },
-  });
-
-  if (!response.ok) {
-    throw new ApiError(`Error: ${response.status}`, response.status);
-  }
-
-  return response.json() as Promise<T>;
-}