[FEATURE] Paginate search_people to retrieve more than 10 results #526

Feature Description

search_people currently returns only the first results page of a LinkedIn people search (~10 results). There is no way to retrieve more. This adds an optional max_pages parameter (1-10, default 1) so callers can paginate through additional pages of results in a single tool call.

Use Case

When searching for people, 10 results is often not enough — e.g. building a shortlist of candidates/recruiters for a given role and location. Today the only way to get more would be additional, unsupported requests. search_jobs already supports max_pages; search_people should offer the same capability for consistency.

Suggested Approach

Mirror the existing search_jobs pagination pattern:

• Add max_pages: Annotated[int, Field(ge=1, le=10)] = 1 to the search_people tool and the LinkedInExtractor.search_people method.
• Paginate via LinkedIn's &page=N URL parameter (1-based), looping up to max_pages, with the existing _NAV_DELAY between navigations.
• Join each page's text into the single search_results section with \n---\n, and dedupe references by URL across pages.
• Stop early, in a locale-independent way, when a page surfaces no new kind: person references (i.e. we have run past the last page) — so over-requesting pages is harmless.
• Default max_pages=1 preserves current behavior exactly (opt-in pagination).
• Update tests, README and manifest.json.