feat: bot reads JIGAIDO_BOT_TOKEN from config file

- config.py: Added _resolve_bot_token() to read from config file
- bot.py: Uses config.config.bot_token instead of env var directly
- test_config.py: Added test for config file token reading

config.py

@@ -13,7 +13,21 @@ class Config:
 
     def __init__(self):
         self.data_dir: Path = self._resolve_data_dir()
-        self.bot_token: Optional[str] = os.environ.get("JIGAIDO_BOT_TOKEN")
+        self.bot_token: Optional[str] = self._resolve_bot_token()
+
+    def _resolve_bot_token(self) -> Optional[str]:
+        env_token = os.environ.get("JIGAIDO_BOT_TOKEN")
+        if env_token:
+            return env_token
+
+        config_file = Path("~/.jigaido/config.json").expanduser()
+        if config_file.exists():
+            with open(config_file) as f:
+                config_data = json.load(f)
+                if "JIGAIDO_BOT_TOKEN" in config_data:
+                    return config_data["JIGAIDO_BOT_TOKEN"]
+
+        return None
 
     def _resolve_data_dir(self) -> Path:
         env_dir = os.environ.get("JIGAIDO_DATA_DIR")
@@ -35,3 +49,6 @@ class Config:
 
 
 config = Config()
+
+
+config = Config()