Support searching jobs via a full LinkedIn job search URL

[mschreib28]

Summary
Add an MCP tool that runs a job search using a full LinkedIn job search URL instead of building the URL from separate parameters. This supports workflows where the user has already defined a search in LinkedIn (saved search, job alert, or manually applied filters) and wants to sync those exact results.

Proposed tool

• Name: search_jobs_by_url
• Input: search_url (string) – full URL, e.g.
  https://www.linkedin.com/jobs/search/?keywords=Principal%20Software%20Architect&f_WT=2&geoId=102433969&sortBy=R&...
• Validation: Only allow URLs that start with https://www.linkedin.com/jobs/search for safety.
• Output: Same shape as existing search_jobs: { url, sections: { search_results: "..." }, pages_visited, sections_requested } so existing parsers and clients can reuse the same logic.

Use cases

• Paste a URL from the browser address bar after applying filters on LinkedIn.
• Use URLs from saved searches or job alerts (e.g. from in-app notifications).
• Support query parameters that the server does not yet expose (e.g. f_SB2, f_TPR with custom values, originToLandingJobPostings, savedSearchId).

Implementation notes

• In the extractor, add a method that validates the URL, calls extract_page(url), and returns the same structure as search_jobs.
• Register a new MCP tool that calls this method with the same auth/browser lifecycle as other tools.

[stickerdaniel]

Extending search_jobs with more filters (#174) covers the same use case, llms should be able to select the right filters from a provided URL.

[stickerdaniel]

implemented in #200