功能：实现 Danding_Points 积分系统插件

- 新增积分系统插件，支持积分查询、签到、转账等核心功能
- 包含对应的测试脚本

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

danding_bot/plugins/danding_points/config.py

@@ -0,0 +1,27 @@
+from pydantic import BaseSettings, validator
+from pathlib import Path
+
+
+class Config(BaseSettings):
+    """Points system configuration."""
+
+    POINTS_DB_FILE: str = "data/danding_points/points.db"
+    POINTS_MAX_BALANCE: int = 0  # 0 = unlimited
+    POINTS_MAX_PER_OPERATION: int = 0  # 0 = unlimited
+    POINTS_LOG_RETENTION_DAYS: int = 365
+
+    class Config:
+        env_prefix = "DANDING_"
+        case_sensitive = True
+
+    @validator("POINTS_MAX_BALANCE", "POINTS_MAX_PER_OPERATION", "POINTS_LOG_RETENTION_DAYS")
+    def validate_non_negative(cls, v):
+        if v < 0:
+            raise ValueError("Value must be non-negative")
+        return v
+
+    @validator("POINTS_DB_FILE")
+    def validate_db_path(cls, v):
+        if not v:
+            raise ValueError("Database file path cannot be empty")
+        return v