feat: add web search block functionality and integrate with existing plugins

- Introduced a new web search block plugin to handle web search queries and results.
- Updated copilot, doc block, and pro block plugins to include web search context in AI completions.
- Implemented utility functions for parsing and building web search markdown.
- Enhanced API to support web search requests and responses.
- Added configuration for web search URL and timeout settings.
- Updated size limit checks to account for web search content.

backend/risk_control.py

@@ -178,7 +178,10 @@ class RedisRiskBackend(BaseRiskBackend):
         value = await self.redis.get(key)
         if value is None:
             return 0
-        return int(value)
+        try:
+            return int(value)
+        except (TypeError, ValueError):
+            return int(float(value))
 
     async def set_int(self, key: str, value: int, ttl_seconds: int) -> None:
         await self.redis.set(key, value, ex=ttl_seconds)