feat(08-01): create crawler data models and test scaffolding

- Add Pydantic models: AnswerData, ArticleData, ContentMetadata, AuthorInfo, CrawlResult
- Create test fixtures in conftest.py with mock browser and sample API responses
- Set up crawler module with __init__.py exports

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_crawler/__init__.py

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+"""Tests for Zhihu Crawler Module"""

tests/test_crawler/conftest.py

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+"""Shared fixtures for Zhihu Crawler tests"""
+
+import pytest
+from unittest.mock import MagicMock, AsyncMock
+
+
+@pytest.fixture
+def mock_page():
+    """Mock Playwright page object.
+
+    Provides a mock page with route method for API interception testing.
+    """
+    page = MagicMock()
+    page.route = MagicMock()
+    page.goto = MagicMock()
+    page.wait_for_selector = MagicMock()
+    page.query_selector = MagicMock()
+    page.close = MagicMock()
+    return page
+
+
+@pytest.fixture
+def mock_browser():
+    """Mock PlaywrightBrowser instance.
+
+    Provides a mock browser with page attribute and lifecycle methods.
+    """
+    browser = MagicMock()
+    browser.page = MagicMock()
+    browser.start = MagicMock()
+    browser.close = MagicMock()
+    browser.goto = MagicMock()
+    return browser
+
+
+@pytest.fixture
+def sample_answer_api_response():
+    """Sample answer API response data.
+
+    Mimics the structure of /api/v4/answers/{id} response.
+    """
+    return {
+        "id": 123456789,
+        "type": "answer",
+        "question": {
+            "id": 987654321,
+            "title": "What is the best way to learn programming?",
+            "type": "question"
+        },
+        "content": "<p>This is a sample answer content in HTML format.</p>",
+        "excerpt": "This is a sample answer content...",
+        "author": {
+            "id": "user123",
+            "name": "John Doe",
+            "url_token": "john-doe-123",
+            "headline": "Software Engineer"
+        },
+        "voteup_count": 1000,
+        "comment_count": 50,
+        "created_time": 1700000000,
+        "updated_time": 1700100000
+    }
+
+
+@pytest.fixture
+def sample_article_api_response():
+    """Sample article API response data.
+
+    Mimics the structure of zhuanlan article API response.
+    """
+    return {
+        "id": 11223344,
+        "title": "How to Build a Web Scraper",
+        "content": "<p>This article explains how to build a web scraper...</p>",
+        "excerpt": "This article explains how to build a web scraper...",
+        "author": {
+            "id": "author456",
+            "name": "Jane Smith",
+            "url_token": "jane-smith-456",
+            "headline": "Tech Writer"
+        },
+        "voteup_count": 500,
+        "comment_count": 25,
+        "created_time": 1699900000,
+        "updated_time": 1700000000
+    }
+
+
+@pytest.fixture
+def sample_answer_url():
+    """Sample Zhihu answer URL."""
+    return "https://www.zhihu.com/question/987654321/answer/123456789"
+
+
+@pytest.fixture
+def sample_article_url():
+    """Sample Zhihu zhuanlan article URL."""
+    return "https://zhuanlan.zhihu.com/p/11223344"
+
+
+@pytest.fixture
+def sample_invalid_url():
+    """Sample invalid URL for testing error handling."""
+    return "https://www.example.com/some-page"