refactor: Phase 3 拆分 generate 流水线并补全测试

提取 collect/formatters/themes 等 pipeline 模块，新增 wecom 分条、RSS、delta、Agent 工作流测试。

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_rss_parse.py

@@ -0,0 +1,54 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+FIXTURES = Path(__file__).parent / "fixtures"
+
+
+def test_parse_sample_rss_fixture():
+    from daily.news.feeds import NEWS_CATEGORIES
+    from daily.news.fetch import _parse_feed
+
+    category = NEWS_CATEGORIES[0]
+    feed_name = category.feeds[0].name
+    xml = (FIXTURES / "sample-rss.xml").read_text(encoding="utf-8")
+    items = _parse_feed(xml, feed_name, category)
+
+    assert len(items) == 1
+    assert items[0]["title"] == "Sample AI headline for smoke tests"
+    assert items[0]["link"] == "https://example.com/ai-news/1"
+    assert items[0]["source_name"] == feed_name
+    assert "minimal RSS item" in items[0]["summary"]
+
+
+def test_fetch_ai_news_offline(monkeypatch):
+    from daily.news import fetch as news_fetch
+
+    sample = {
+        "title": "Sample AI headline for smoke tests",
+        "link": "https://example.com/ai-news/1",
+        "summary": "A minimal RSS item used by offline tests.",
+        "published": "Wed, 02 Jul 2026 08:00:00 GMT",
+        "source_name": "OpenAI",
+        "category_id": "official",
+        "category_name": "厂商官方",
+        "category_icon": "🏢",
+    }
+
+    monkeypatch.setattr(
+        news_fetch,
+        "_fetch_news",
+        lambda categories: {
+            "enabled": True,
+            "hours": 72,
+            "categories": [{"id": "official", "name": "厂商官方", "icon": "🏢", "items": [sample]}],
+            "flat": [sample],
+            "stats": {"feeds_total": 1, "feeds_ok": 1, "items_raw": 1, "feeds_failed": []},
+        },
+    )
+
+    payload = news_fetch.fetch_ai_news()
+    assert payload["enabled"] is True
+    assert payload["flat"][0]["title"].startswith("Sample AI")