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_steam_info/config.py

@@ -0,0 +1,33 @@
+from typing import Optional, Union, List
+from pydantic import BaseModel, validator
+
+
+class Config(BaseModel):
+    steam_api_key: Union[str, List[str]]
+    proxy: Optional[str] = None
+    steam_request_interval: int = 300  # seconds
+    steam_broadcast_type: str = "part"  # all, part, none
+    steam_disable_broadcast_on_startup: bool = False
+    steam_font_regular_path: Optional[str] = "hexi/resource/fonts/MiSans-Regular.ttf"
+    steam_font_light_path: Optional[str] = "hexi/resource/fonts/MiSans-Light.ttf"
+    steam_font_bold_path: Optional[str] = "hexi/resource/fonts/MiSans-Bold.ttf"
+
+    # 仅用于迁移旧 JSON 状态文件(运行时 API key 状态已持久化到 SQLite)
+    steam_api_key_state_path: Optional[str] = "hexi/data/api_keys_state.json"
+
+    # 游玩时长表图片主题: light / dark,默认亮色
+    steam_playtime_theme: str = "light"
+
+    @validator("steam_playtime_theme")
+    def check_theme(cls, v):
+        v = (v or "light").strip().lower()
+        if v not in ("light", "dark"):
+            raise ValueError("steam_playtime_theme 只能是 light 或 dark")
+        return v
+
+    @validator("steam_api_key", pre=True)
+    def ensure_list(cls, v):
+        if isinstance(v, str):
+            return [v]
+        return v
+