Add news API integration and related configurations

- Update .env.example to include NEWS_API_KEY configuration
- Add newsapi-python dependency in pyproject.toml
- Implement NewsAPI class for fetching news articles
- Create Article model for structured news data
- Add tests for NewsAPI functionality in test_news_api.py
- Update pytest configuration to include news marker

src/app/news/__init__.py

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+from .news_api import NewsAPI
+
+__all__ = ["NewsAPI"]

src/app/news/base.py

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+from pydantic import BaseModel
+
+class Article(BaseModel):
+    source: str = ""
+    time: str = ""
+    title: str = ""
+    description: str = ""
+

src/app/news/news_api.py

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+import os
+import newsapi
+from .base import Article
+
+
+def result_to_article(result: dict) -> Article:
+    article = Article()
+    article.source = result.get("source", {}).get("name", "")
+    article.time = result.get("publishedAt", "")
+    article.title = result.get("title", "")
+    article.description = result.get("description", "")
+    return article
+
+class NewsAPI:
+    def __init__(self):
+        api_key = os.getenv("NEWS_API_KEY")
+        assert api_key is not None, "NEWS_API_KEY environment variable not set"
+
+        self.client = newsapi.NewsApiClient(api_key=api_key)
+        self.category = "business"
+        self.language = "en"
+        self.page_size = 100
+
+    def get_top_headlines(self, query:str, total:int=100) -> list[Article]:
+        page_size = min(self.page_size, total)
+        pages = (total // page_size) + (1 if total % page_size > 0 else 0)
+        articles = []
+        for page in range(1, pages + 1):
+            headlines = self.client.get_top_headlines(category=self.category, language=self.language, page_size=page_size, page=page)
+            results = [result_to_article(article) for article in headlines.get("articles", [])]
+            articles.extend(results)
+        return articles
+
+