feat: init rssKeeper - RSS 抓取、管理与检索系统

完整功能包括:
- FastAPI 后端 + SQLite + FTS5 全文搜索
- RSS 源管理、自动发现、OPML 导入导出
- 文章抓取、去重、分类、全文检索
- RSS 源健康度监控
- Vue 3 + Element Plus 暗色主题 Web UI
- 对外 REST API 供 AI 分析调用
- Docker + docker-compose 部署

backend/fulltext_search.py

@@ -0,0 +1,81 @@
+"""SQLite FTS5 全文搜索封装"""
+from sqlalchemy import text
+from database import engine
+
+
+def search_articles(query: str, limit: int = 50, offset: int = 0):
+    """全文搜索文章
+    返回 [(article_id, title, content_snippet, rank), ...]
+    """
+    if not query or not query.strip():
+        return [], 0
+
+    # 转义 FTS5 特殊字符
+    query = query.replace('"', '""').strip()
+
+    conn = engine.raw_connection()
+    cursor = conn.cursor()
+
+    try:
+        # 使用 FTS5 查询
+        sql = """
+            SELECT a.id, a.title, a.summary, a.link, a.published_at, a.created_at,
+                   f.id as feed_id, f.title as feed_title, f.category,
+                   rank
+            FROM articles_fts
+            JOIN articles a ON articles_fts.rowid = a.id
+            JOIN feeds f ON a.feed_id = f.id
+            WHERE articles_fts MATCH ?
+            ORDER BY rank
+            LIMIT ? OFFSET ?
+        """
+        cursor.execute(sql, (query, limit, offset))
+        rows = cursor.fetchall()
+
+        # 获取总数
+        count_sql = """
+            SELECT COUNT(*) FROM articles_fts WHERE articles_fts MATCH ?
+        """
+        cursor.execute(count_sql, (query,))
+        total = cursor.fetchone()[0]
+
+        results = []
+        for row in rows:
+            results.append({
+                "id": row[0],
+                "title": row[1],
+                "summary": row[2],
+                "link": row[3],
+                "published_at": row[4],
+                "created_at": row[5],
+                "feed_id": row[6],
+                "feed_title": row[7],
+                "category": row[8],
+            })
+
+        return results, total
+    except Exception as e:
+        # FTS5 查询失败时返回空结果
+        return [], 0
+    finally:
+        cursor.close()
+        conn.close()
+
+
+def rebuild_fts_index():
+    """重建 FTS5 索引（数据不一致时使用）"""
+    conn = engine.raw_connection()
+    cursor = conn.cursor()
+    try:
+        cursor.execute("DELETE FROM articles_fts")
+        cursor.execute("""
+            INSERT INTO articles_fts(rowid, title, content)
+            SELECT id, title, content FROM articles
+        """)
+        conn.commit()
+        return True
+    except Exception:
+        return False
+    finally:
+        cursor.close()
+        conn.close()