fix(reddit,bilibili): switch to rdt-cli and add bili-cli support (#235)

Reddit: Exa crawling had chronic CRAWL_LIVECRAWL_TIMEOUT issues.
rdt-cli (304 stars, public-clis) works without login — search, read
full posts, and comments all verified. Massive improvement.

Bilibili: add bili-cli (590 stars) as optional enhanced backend for
hot/rank/search/feed. yt-dlp remains for video metadata + subtitles.

Also fix UA string (was "agent-reach/1.0", now proper browser UA).

75 tests passing.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

agent_reach/channels/bilibili.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-"""Bilibili — video via yt-dlp, search via /x/web-interface API."""
+"""Bilibili — video via yt-dlp, search/browse via bili-cli or API."""
 
 import json
 import os
@@ -8,7 +8,7 @@ import subprocess
 import urllib.request
 from .base import Channel
 
-_UA = "agent-reach/1.0"
+_UA = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36"
 _TIMEOUT = 10
 _SEARCH_API = "https://api.bilibili.com/x/web-interface/search/all/v2?keyword=test&page=1"
 
@@ -24,23 +24,10 @@ def _search_api_ok() -> bool:
         return False
 
 
-def _bilisearch_ok() -> bool:
-    """Return True if yt-dlp bilisearch works without 412."""
-    try:
-        result = subprocess.run(
-            ["yt-dlp", "--flat-playlist", "--no-download", "-j",
-             "bilisearch1:test"],
-            capture_output=True, text=True, timeout=_TIMEOUT,
-        )
-        return result.returncode == 0
-    except Exception:
-        return False
-
-
 class BilibiliChannel(Channel):
     name = "bilibili"
-    description = "B站视频和字幕"
-    backends = ["yt-dlp", "B站搜索 API"]
+    description = "B站视频、字幕和搜索"
+    backends = ["yt-dlp", "bili-cli (可选)", "B站搜索 API"]
     tier = 1
 
     def can_handle(self, url: str) -> bool:
@@ -53,11 +40,7 @@ class BilibiliChannel(Channel):
             return "off", "yt-dlp 未安装。安装：pip install yt-dlp"
 
         proxy = (config.get("bilibili_proxy") if config else None) or os.environ.get("BILIBILI_PROXY")
-
-        # 检测搜索 API 连通性
-        api_ok = _search_api_ok()
-        # 检测 yt-dlp bilisearch 是否 412
-        ytdlp_search_ok = _bilisearch_ok()
+        has_bili_cli = bool(shutil.which("bili"))
 
         parts = []
 
@@ -65,16 +48,19 @@ class BilibiliChannel(Channel):
         if proxy:
             parts.append("视频读取：yt-dlp（代理已配置）")
         else:
-            parts.append("视频读取：yt-dlp（本地环境，服务器可能需要代理）")
+            parts.append("视频读取：yt-dlp")
 
-        # 搜索状态
-        if api_ok:
-            parts.append("搜索：B站 API 可用（/x/web-interface/search/all/v2）")
+        # bili-cli 增强
+        if has_bili_cli:
+            parts.append("搜索/热门/排行：bili-cli 可用")
         else:
-            parts.append("搜索：B站 API 不可达，搜索功能可能受限")
+            # 检测搜索 API 连通性
+            api_ok = _search_api_ok()
+            if api_ok:
+                parts.append("搜索：B站 API 可用")
+            else:
+                parts.append("搜索：B站 API 不可达")
+            parts.append("提示：安装 bili-cli 可解锁热门/排行/动态：pipx install bilibili-cli")
 
-        if not ytdlp_search_ok:
-            parts.append("提示：yt-dlp bilisearch 不可用（可能 HTTP 412 反爬），搜索将走 B站 API")
-
-        status = "ok" if api_ok else "warn"
+        status = "ok" if has_bili_cli or _search_api_ok() else "warn"
         return status, "。".join(parts)