- Switch /api/oauth/email/bind and /api/oauth/wechat/bind from GET to
POST with JSON body for better REST semantics
- Normalize password reset endpoint to return consistent responses
- Apply url.QueryEscape to WeChat code parameter for robustness
- Update user and wechat controllers to use sessions for user ID
- Modify ID retrieval to use `session.Get("id")` instead of `c.GetInt("id")`
- Cast session ID to int when creating user object
