feat: add NovelPage component with bookshelf, open book, and reading views

backend/services/fiction_event_plan_progress.py

@@ -0,0 +1,34 @@
+"""
+事件纲要生成进度广播 — 供 NDJSON 订阅端与后台流水线共享。
+"""
+from __future__ import annotations
+
+import asyncio
+from typing import Any, AsyncIterator, Dict, List
+
+_subscribers: Dict[str, List[asyncio.Queue]] = {}
+
+
+def emit(book_id: str, event: Dict[str, Any]) -> None:
+    for q in list(_subscribers.get(book_id, [])):
+        try:
+            q.put_nowait(event)
+        except asyncio.QueueFull:
+            pass
+
+
+async def subscribe(book_id: str) -> AsyncIterator[Dict[str, Any]]:
+    q: asyncio.Queue = asyncio.Queue(maxsize=128)
+    _subscribers.setdefault(book_id, []).append(q)
+    try:
+        while True:
+            item = await q.get()
+            yield item
+            if item.get("type") in ("done", "error"):
+                break
+    finally:
+        subs = _subscribers.get(book_id, [])
+        if q in subs:
+            subs.remove(q)
+        if not subs:
+            _subscribers.pop(book_id, None)