Add HeXi bot codebase: custom plugins, web frontends, tests

- hexi core: message handling, rate limiting, cooldown, plugin manager
- Custom plugins: BF stats, daily check-in, quotes, persona cards, etc.
- Community plugins vendored under hexi/plugins with local fixes
- Web admin frontends (learning-chat, persona-admin), unified hexi/web
- Tests for rate_limit/cooldown/memes/persona; poetry.lock

Co-Authored-By: Claude <noreply@anthropic.com>

hexi/plugins/nonebot_plugin_picstatus/util.py

@@ -0,0 +1,39 @@
+import re
+from functools import partial
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+from cookit import DebugFileWriter, auto_convert_unit, format_timedelta
+
+if TYPE_CHECKING:
+    from .collectors.cpu import CpuFreq
+
+format_time_delta_ps = partial(format_timedelta, day_divider=" ", day_suffix="天")
+
+
+def match_list_regexp(reg_list: list[str], txt: str) -> re.Match | None:
+    return next((match for r in reg_list if (match := re.search(r, txt))), None)
+
+
+def format_freq(value: float) -> str:
+    """将 MHz 频率格式化为 MHz/GHz(十进制 1000 换算)"""
+    return auto_convert_unit(
+        units=("MHz", "GHz", "THz"),
+        multiplier=1000,
+        unit_threshold=1000,
+        value=value,
+        with_space=False,
+    )
+
+
+def format_cpu_freq(freq: "CpuFreq") -> str:
+    if not freq.current and not freq.max:
+        return "主频未知"
+    current = freq.current or freq.max or 0.0
+    max_freq = freq.max or 0.0
+    if not max_freq or max_freq == current:
+        return format_freq(current)
+    return f"{format_freq(current)} / {format_freq(max_freq)}"
+
+
+debug = DebugFileWriter(Path(__file__).resolve().parents[2] / "logs", "picstatus")