feat(telegram): candidate list/delete/clear commands

私聊新增 /candidate [页码]（待决策列表）、/candi_del（标题按钮逐条删除，删后原地重建键盘、可翻页连续删）、/candi_clear（全部/待决策/取消）。重构 handle_callback 为前缀分派（cdel/cpage/cclr，保留 add/ign/blk/fav）；repository 加 list_pending_candidates/delete_all_candidates；LibraryService 加 pending_candidates/delete_candidate/clear_candidates 并刷看板缓存。

tests/test_telegram.py

@@ -11,11 +11,16 @@ sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 sys.stdout.reconfigure(encoding="utf-8")
 
 from reaction_board.notify.telegram import (  # noqa: E402
+    CANDIDATE_DELETE_HEADER,
     HELP_TEXT,
     TelegramClient,
     TelegramError,
+    candidate_delete_keyboard,
+    clear_candidates_keyboard,
+    format_candidate_list,
     format_duration,
     format_manual_reply,
+    truncate_title,
 )
 from reaction_board.services.library import (  # noqa: E402
     ActionResult,
@@ -147,7 +152,9 @@ class FakeBot:
         self.fail_answer = fail_answer
         self.answers = []
         self.sent = []
+        self.markups = []
         self.edits = []
+        self.edit_markups = []
 
     def get_updates(self, offset=None):
         return list(self.updates)
@@ -157,17 +164,21 @@ class FakeBot:
             raise RuntimeError("HTTP Error 400: Bad Request")
         self.answers.append((callback_id, text))
 
-    def send_text(self, text):
+    def send_text(self, text, reply_markup=None):
         self.sent.append(text)
+        self.markups.append(reply_markup)
 
-    def edit_reply_markup(self, message_id):
+    def edit_reply_markup(self, message_id, reply_markup=None):
         self.edits.append(message_id)
+        self.edit_markups.append(reply_markup)
 
 
 class FakeActions:
     def __init__(self):
         self.calls = []
         self.manual = []
+        self.candidates = []
+        self.clears = []
 
     def ingest_candidate(self, aid):
         self.calls.append(("add", aid))
@@ -190,6 +201,27 @@ class FakeActions:
             results=[IngestResult(True, 9, "added", title="咻咻满 reaction", message="已入库")],
         )
 
+    def pending_candidates(self):
+        return list(self.candidates)
+
+    def delete_candidate(self, aid):
+        self.calls.append(("cdel", aid))
+        for index, candidate in enumerate(self.candidates):
+            if candidate["aid"] == aid:
+                return self.candidates.pop(index)
+        return None
+
+    def clear_candidates(self, *, pending_only=False):
+        self.clears.append(pending_only)
+        total = len(self.candidates)
+        if pending_only:
+            self.candidates = [
+                c for c in self.candidates if c.get("decision") is not None
+            ]
+            return total - len(self.candidates)
+        self.candidates = []
+        return total
+
 
 ADD_REPLY = "✅ 已入库《咻咻满 reaction》（aid 9）"
 
@@ -266,6 +298,118 @@ def test_answer_failure_falls_back_to_text():
     assert bot.edits == [10]
 
 
+def candidates(n, *, start=1):
+    return [
+        {"aid": 100 + i, "title": f"咻咻满 reaction {i}"}
+        for i in range(start, start + n)
+    ]
+
+
+def test_truncate_and_keyboard_helpers():
+    assert truncate_title("短标题") == "短标题"
+    long_title = "咻咻满" + "反" * 40
+    out = truncate_title(long_title, 20)
+    assert len(out) == 20 and out.endswith("…")
+    assert truncate_title("") == "(无标题)"
+
+    items = candidates(12)
+    text = format_candidate_list(items, 1)
+    assert "共 12 条 · 第 1/2 页" in text
+    assert "咻咻满 reaction 1" in text
+    assert "咻咻满 reaction 11" not in text
+    assert "第 2/2 页" in format_candidate_list(items, 2)
+    assert "第 2/2 页" in format_candidate_list(items, 99)  # 页码越界夹取到末页
+    assert format_candidate_list([], 1) == "暂无待决策候选。"
+
+    keyboard = candidate_delete_keyboard(items, 1)
+    assert keyboard["inline_keyboard"][0][0]["callback_data"] == "cdel:1:101"
+    assert keyboard["inline_keyboard"][-1][0]["callback_data"] == "cpage:del:0"
+    clear_kb = clear_candidates_keyboard()
+    assert [b["callback_data"] for b in clear_kb["inline_keyboard"][0]] == [
+        "cclr:all", "cclr:pending", "cclr:cancel",
+    ]
+
+
+def test_candidate_list_command_pages():
+    bot = FakeBot([
+        message_update(1, "/candidate"),
+        message_update(2, "/candidate 2"),
+        message_update(3, "/candidate@re_xxm_bot"),
+    ])
+    actions = FakeActions()
+    actions.candidates = candidates(12)
+    TelegramPoller(bot, actions).run_once(None)
+    assert "共 12 条 · 第 1/2 页" in bot.sent[0]
+    assert "第 2/2 页" in bot.sent[1]
+    assert "第 1/2 页" in bot.sent[2]  # @BotName 后缀也能解析
+
+
+def test_candi_del_keyboard_and_rebuild():
+    bot = FakeBot([
+        message_update(1, "/candi_del"),
+        update(2, "cdel:1:101"),
+        update(3, "cpage:del:2"),
+    ])
+    actions = FakeActions()
+    actions.candidates = candidates(12)
+    TelegramPoller(bot, actions).run_once(None)
+
+    assert bot.sent[0] == CANDIDATE_DELETE_HEADER
+    keyboard = bot.markups[0]
+    assert keyboard["inline_keyboard"][0][0]["text"] == "咻咻满 reaction 1"
+    assert keyboard["inline_keyboard"][0][0]["callback_data"] == "cdel:1:101"
+
+    assert ("cdel", 101) in actions.calls
+    assert bot.answers[0] == ("cb2", "✅ 已删除：咻咻满 reaction 1")
+    # 删除 101 后重建第一页键盘（新首条 102）
+    assert bot.edit_markups[0]["inline_keyboard"][0][0]["callback_data"] == "cdel:1:102"
+
+    # 翻到第 2 页（剩余 11 条：102..112 → 第 2 页仅 112）
+    assert bot.answers[1] == ("cb3", "第 2 页")
+    assert bot.edit_markups[1]["inline_keyboard"][0][0]["callback_data"] == "cdel:2:112"
+
+
+def test_candi_del_empty():
+    bot = FakeBot([message_update(1, "/candi_del")])
+    TelegramPoller(bot, FakeActions()).run_once(None)
+    assert bot.sent == ["暂无待决策候选。"]
+    assert bot.markups == [None]
+
+
+def test_candi_clear_buttons():
+    bot = FakeBot([
+        message_update(1, "/candi_clear"),
+        update(2, "cclr:pending"),
+        update(3, "cclr:cancel"),
+    ])
+    actions = FakeActions()
+    actions.candidates = candidates(3) + [
+        {"aid": 999, "title": "已决策", "decision": "rejected"}
+    ]
+    TelegramPoller(bot, actions).run_once(None)
+
+    keyboard = bot.markups[0]
+    assert [b["callback_data"] for b in keyboard["inline_keyboard"][0]] == [
+        "cclr:all", "cclr:pending", "cclr:cancel",
+    ]
+    assert actions.clears == [True]  # 只清待决策
+    assert bot.answers[0] == ("cb2", "已清空 3 条")
+    assert bot.edit_markups[0] == {"inline_keyboard": []}
+    assert bot.answers[1] == ("cb3", "已取消")
+
+
+def test_candidate_commands_unauthorized_and_unknown():
+    bot = FakeBot([message_update(1, "/candidate", chat_id=999)])
+    actions = FakeActions()
+    actions.candidates = candidates(3)
+    TelegramPoller(bot, actions).run_once(None)
+    assert bot.sent == []
+
+    bot2 = FakeBot([message_update(1, "/nope")])
+    TelegramPoller(bot2, FakeActions()).run_once(None)
+    assert bot2.sent == [HELP_TEXT]
+
+
 class Recorder:
     def __init__(self):
         self.events = []
@@ -322,6 +466,12 @@ def main():
     test_poller_dispatch_and_authorization()
     test_poller_manual_message()
     test_answer_failure_falls_back_to_text()
+    test_truncate_and_keyboard_helpers()
+    test_candidate_list_command_pages()
+    test_candi_del_keyboard_and_rebuild()
+    test_candi_del_empty()
+    test_candi_clear_buttons()
+    test_candidate_commands_unauthorized_and_unknown()
     test_poller_backoff_and_recovery()
     print("OK: Telegram 消息、分片、长轮询与回调授权测试全部通过")