Integration: add Reserp web search

integrations/reserp.md

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+---
+layout: integration
+name: Reserp
+description: Google Search API v2 for Haystack
+authors:
+    - name: Reserp
+      socials:
+        github: reserp-ai
+        twitter: reserp_ai
+        linkedin: https://www.linkedin.com/company/reserp-ai
+pypi: https://pypi.org/project/reserp-haystack
+repo: https://github.com/reserp-ai/reserp-haystack
+type: Search & Extraction
+report_issue: https://github.com/reserp-ai/reserp-haystack/issues
+logo: /logos/reserp.png
+version: Haystack 2.0
+toc: true
+---
+
+## Overview
+
+[`Reserp`](https://reserp.ai/) is a Google Search API that accepts a complete Google Search URL. API v2 offers flat search results and a separate structured SERP response.
+
+`ReserpWebSearch` uses `POST /v2/serp/search`. One component invocation makes one API request and exposes the public JSON response. Its `results[]` array is flat, page ordered, and deduplicated, with optional visible text for each URL. Retries, timeouts, task queues, concurrency, caching, observability, and pagination remain under the pipeline's control.
+
+## Installation
+
+```bash
+pip install reserp-haystack
+```
+
+Set the API key in the environment:
+
+```bash
+export RESERP_API_KEY='your-api-key'
+```
+
+## Usage
+
+### Components
+
+- `ReserpWebSearch`: sends one complete Google Search URL to the v2 Search endpoint and exposes the public response under the `response` output.
+
+```python
+from haystack_integrations.components.websearch.reserp import ReserpWebSearch
+
+search = ReserpWebSearch()
+response = search.run(
+    url="https://www.google.com/search?q=haystack+ai&gl=us&hl=en"
+)["response"]
+
+if response["ok"]:
+    for item in response["results"]:
+        print(item.get("text"), item["url"])
+```
+
+Every successful response includes `pagination.next_url`. Submit it in a later component call to advance, but do not treat its presence as proof that another page contains results or infer pagination from `len(response["results"])`.
+
+Version 0.3 adopts the stable Search endpoint and its flat `results[]` response. It also exposes the v2 field names `request.url`, `page.url`, `pagination.next_url`, and `billing_source`. For typed, page-ordered SERP blocks and explicit positions, use Reserp's structured v2 endpoint or an official Reserp SDK.
+
+See the complete [Reserp API documentation](https://reserp.ai/docs) for request, response, errors, and pagination.
+
+## License
+
+`reserp-haystack` is distributed under the MIT license.