fix: danmaku template now uses event rules; rules apply instantly on save

- _on_danmaku renders via event_text(rules, 'danmaku', ...) like all other
  events; hardcoded {uname}说、 {msg} format removed
- Drop message_format param from DanmakuHandler/DanmakuClient/server/main
- api_rules_post mutates the shared rules dict in place (clear+update)
  instead of rebinding, so running handlers pick up new templates
  immediately without restarting TTS
- UI save toast: '规则已保存并即时生效'
- Verified: custom template 卧槽！、是{uname}！、他说、 {msg} works;
  save-then-next-danmaku uses new template without restart

danmaku_handler.py

@@ -20,8 +20,6 @@ from event_rules import (
 
 logger = logging.getLogger(__name__)
 
-DANMAKU_FORMAT = "{uname}\u8bf4\u3001 {msg}"
-
 INTERACT_TYPE_NAMES = {
     3: "\u5206\u4eab", 4: "\u7279\u522b\u5173\u6ce8", 5: "\u4e92\u7c89",
 }
@@ -32,12 +30,10 @@ class DanmakuHandler(blivedm.BaseHandler):
 
     _CMD_CALLBACK_DICT = blivedm.BaseHandler._CMD_CALLBACK_DICT.copy()
 
-    def __init__(self, queue: asyncio.Queue, rules: dict | None = None,
-                 message_format: str = DANMAKU_FORMAT):
+    def __init__(self, queue: asyncio.Queue, rules: dict | None = None):
         super().__init__()
         self._queue = queue
         self._rules = rules or dict(DEFAULT_RULES)
-        self._message_format = message_format
         self._count = 0
 
     # ── custom SEND_GIFT callback to capture blind-gift info ──────────
@@ -62,11 +58,12 @@ class DanmakuHandler(blivedm.BaseHandler):
     def _on_danmaku(self, client: blivedm.BLiveClient, message: DanmakuMessage) -> None:
         if not message.msg.strip():
             return
-        text = self._message_format.format(
-            uname=message.uname,
-            msg=message.msg,
-            uid=message.uid,
-        )
+        text = event_text(self._rules, "danmaku",
+                          uname=message.uname,
+                          msg=message.msg,
+                          uid=message.uid)
+        if not text:
+            return
         self._count += 1
         if self._count % 20 == 1:
             logger.info("Danmaku #%d: %s", self._count, text)
@@ -173,13 +170,11 @@ class DanmakuClient:
         queue: asyncio.Queue,
         cookies: Optional[dict[str, str]] = None,
         rules: dict | None = None,
-        message_format: str = DANMAKU_FORMAT,
     ):
         self._room_id = room_id
         self._queue = queue
         self._cookies = cookies
         self._rules = rules or dict(DEFAULT_RULES)
-        self._message_format = message_format
         self._client: Optional[blivedm.BLiveClient] = None
         self._session: Optional["aiohttp.ClientSession"] = None
 
@@ -187,7 +182,7 @@ class DanmakuClient:
         import aiohttp
         self._session = await build_danmaku_session(self._cookies)
         self._client = blivedm.BLiveClient(self._room_id, session=self._session)
-        handler = DanmakuHandler(self._queue, self._rules, self._message_format)
+        handler = DanmakuHandler(self._queue, self._rules)
         self._client.set_handler(handler)
         self._client.start()
         logger.info("Connected to room %d", self._room_id)