Rename page parameter to page_url in extract_page_content for clarity

[Copilot]

Addresses review feedback on PR #94: the page parameter in extract_page_content was confusingly named since self.page is the Playwright Page object.

Changes

• Renamed page → page_url in extract_page_content() method signature and all internal references
• The "latest-news" in page_url check now clearly operates on the URL string, not the Playwright Page instance

# Before: confusing naming
async def extract_page_content(self, page):
    await self.page.goto(page)  # self.page vs page - which is which?
    "type": "noticia" if "latest-news" in page else "general"

# After: clear distinction
async def extract_page_content(self, page_url):
    await self.page.goto(page_url)  # self.page is Playwright, page_url is the URL
    "type": "noticia" if "latest-news" in page_url else "general"

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